Kate Gosselin gets emotional while celebrating the sextuplets birthday without Collin on 'Kate Plus 8'


Kate Gosselin celebrated her sextuplets 13th birthday on Monday's all new episode of Kate Plus 8, but one of the reality star's children was noticeably missing from the festivities -- her son, Collin.

Five of Kate's sextuplets -- Aaden, Alexis, Hannah, Leah and Joel -- had a great time at their camping-themed party, which was filmed back in May, and included fun activities and tents set up in their back yard.

As part of their celebration, the boys foraged for supplies that their mom had hidden around the property, and went on a scavenger hunt while learning how to use a compass. They also cooked their own food -- like corn and hot dogs -- over a camp fire.

WATCH: Gosselin Family Celebrates Sextuplets' 13th Birthday With Glamping and Camping Parties!

See photos of the Gosselin family through the years:

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Credit: TLC
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CELEBRITY WIFE SWAP - 'Kate Gosselin / Kendra Wilkinson' - Season Two of 'Celebrity Wife Swap' kicks off with reality television mom Kate Gosselin ('Kate Plus 8') and former Playboy Magazine cover girl Kendra Wilkinson (ABC's 'Splash'), TUESDAY, FEBRUARY 26 (8:00-9:00 p.m., ET) on the ABC Television Network. (Photo by Donna Svennevik/ABC via Getty Images) KATE GOSSELIN, JOEL KEVIN GOSSELIN, COLLIN THOMAS GOSSELIN, MADELYN 'MADY' KATE GOSSELIN, AADEN JONATHAN GOSSELIN, CARA NICOLE GOSSELIN, LEAH HOPE GOSSELIN, ALEXIS FAITH GOSSELIN, HANNAH JOY GOSSELIN
CELEBRITY WIFE SWAP - 'Kate Gosselin / Kendra Wilkinson' - Season Two of 'Celebrity Wife Swap' kicks off with reality television mom Kate Gosselin ('Kate Plus 8') and former Playboy Magazine cover girl Kendra Wilkinson (ABC's 'Splash'), TUESDAY, FEBRUARY 26 (8:00-9:00 p.m., ET) on the ABC Television Network. (Photo by Donna Svennevik/ABC via Getty Images) ALEXIS FAITH GOSSELIN, HANNAH JOY GOSSELIN, LEAH HOPE GOSSELIN, JOEL KEVIN GOSSELIN, AADEN JONATHAN GOSSELIN, COLLIN THOMAS GOSSELIN
CELEBRITY WIFE SWAP - 'Kate Gosselin / Kendra Wilkinson' - Season Two of 'Celebrity Wife Swap' kicks off with reality television mom Kate Gosselin ('Kate Plus 8') and former Playboy Magazine cover girl Kendra Wilkinson (ABC's 'Splash'), TUESDAY, FEBRUARY 26 (8:00-9:00 p.m., ET) on the ABC Television Network. (Photo by Donna Svennevik/ABC via Getty Images) JOEL KEVIN GOSSELIN, COLLIN THOMAS GOSSELIN, AADEN JONATHAN GOSSELIN, LEAH HOPE GOSSELIN, ALEXIS FAITH GOSSELIN, HANNAH JOY GOSSELIN
CELEBRITY WIFE SWAP - 'Kate Gosselin / Kendra Wilkinson' - Season Two of 'Celebrity Wife Swap' kicks off with reality television mom Kate Gosselin ('Kate Plus 8') and former Playboy Magazine cover girl Kendra Wilkinson (ABC's 'Splash'), TUESDAY, FEBRUARY 26 (8:00-9:00 p.m., ET) on the ABC Television Network. (Photo by Donna Svennevik/ABC via Getty Images) KATE GOSSELIN, GOSSELIN CHILDREN
CELEBRITY WIFE SWAP - 'Kate Gosselin / Kendra Wilkinson' - Season Two of 'Celebrity Wife Swap' kicks off with reality television mom Kate Gosselin ('Kate Plus 8') and former Playboy Magazine cover girl Kendra Wilkinson (ABC's 'Splash'), TUESDAY, FEBRUARY 26 (8:00-9:00 p.m., ET) on the ABC Television Network. (Photo by Donna Svennevik/ABC via Getty Images) JOEL KEVIN GOSSELIN, COLLIN THOMAS GOSSELIN, AADEN JONATHAN GOSSELIN, LEAH HOPE GOSSELIN, HANNAH JOY GOSSELIN, ALEXIS FAITH GOSSELIN
TODAY -- Pictured: (l-r) Kate Gosselin and John Gosselin talk about their twin daughters and sextuplets on NBC News' 'Today' on October 2, 2007 -- Photo by: Heidi Gutman/NBC NewsWire
NEW YORK - APRIL 23: From 'Jon + Kate Plus 8' Kate Gosselin (L) and her children with President and CEO of TLC Angela Shapiro (R) speaking at the Discovery Upfront event at Jazz at Lincoln Center on April 23, 2008 in New York City. (Photo by Amy Sussman/Getty Images for Discovery)
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Meanwhile, the girls decided to have fun "glamping." They made flower crowns with arts and crafts kits and got mani-pedis from an on-site manicurist. Their fancy dinner was filet mignon served on a table, just like how elegant people camp.

Finally, after all the fun and games, it was time for their cakes. That's right, two awesome cakes to commemorate the milestone birthday. For the boys, there was a cake decorated with fire, while the girls enjoyed a regal, two-tiered pink cake, complete with a pink tent on top and the number 13.

NEWS: Kate and Jon Gosselin Share Birthday Messages for Sextuplets on Their 13th Birthday

While a good time was had by all at the party, the kids' 13-year-old sibling, Collin, was nowhere to be seen.

Kate revealed in August that she had enrolled Collin in a program away from home to help him cope with "special needs."

"[There's] a fairly fluid diagnosis of what those needs are, but he needs to learn certain strategies to help him deal with things," the 42-year-old reality star told People Magazine last year. "This has been a struggle we've had for a very long time."

Kate said she and her seven other children miss Collin all time, explaining, " it's been hard because there is a huge hole in our family without him here... But it comforts us to know he's where he needs to be right now, and I can feel good about that."

See photos of Kate Gosselin through the years:

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Kate Gosselin through the years
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Kate Gosselin through the years
CELEBRITY APPRENTICE -- Finale Red Carpet and Party -- Pictured: Kate Gosselin on Monday, February 16, 2015 -- (Photo by: Mike Pont/NBC/NBCU Photo Bank via Getty Images)
NEW YORK NY - APRIL 05: Kate Gosselin sighting on April 5, 2014 in New York City. (Photo by Josiah Kamau/BuzzFoto/FilmMagic)
TODAY -- Pictured: (l-r) Kate Gosselin and John Gosselin talk about their twin daughters and sextuplets on NBC News' 'Today' on October 2, 2007 -- Photo by: Heidi Gutman/NBC NewsWire
NEW YORK, NY - APRIL 23: Television personalities John and Kate Gosselin attend the Discovery Upfront Presentation NY - Talent Images at the Frederick P. Rose Hall on April 23, 2008 in New York City.(Photo by Thos Robinson/Getty Images for Discovery)
NEW YORK, NY - APRIL 23: Television personalities John and Kate Gosselin and President & CEO of Discovery Communications David Zaslav attend the Discovery Upfront Presentation NY - Talent Images at the Frederick P. Rose Hall on April 23, 2008 in New York City.(Photo by Thos Robinson/Getty Images for Discovery)
NEW YORK - MARCH 04: 'Dancing with the Stars' Tony Dovolani and Kate Gosselin attend the premiere of 'Life' at Alice Tully Hall, Lincoln Center on March 4, 2010 in New York City. (Photo by Charles Eshelman/FilmMagic)
NEW YORK - MARCH 17: Kate Gosselin and her bodyguard Steve Neild leave after having lunch at Sarabeth's Central Park South on March 17, 2010 in New York City. (Photo by James Devaney/WireImage)
LAS VEGAS, NV - MARCH 29: MGM Grand President and Chief Operating Officer Scott Sibella (L) and television personality Kate Gosselin attend the grand opening of Brad Garrett's Comedy Club at the MGM Grand Hotel/Casino on March 29, 2012 in Las Vegas, Nevada. (Photo by David Becker/WireImage)
PASADENA, CA - JANUARY 16: TV personality Kate Gosselin of 'The Celebrity Apprentice' poses for a portrait during the NBCUniversal TCA Press Tour at The Langham Huntington, Pasadena on January 16, 2015 in Pasadena, California. (Photo by: Christopher Polk/NBC/NBCU Photo Bank via Getty Images) NUP_166973_2046.JPG
NEW YORK, NY - JUNE 19: Television personality Kate Gosselin enters the 'Good Morning America' taping at the ABC Times Square Studios on June 19, 2014 in New York City. (Photo by Ray Tamarra/GC Images)
GOOD MORNING AMERICA - Kate Gosselin is a guest on 'Good Morning America,' 6/19/14, airing on the ABC Television Network. (Photo by Fred Lee/ABC via Getty Images)
NEW YORK, NY - APRIL 01: Kate Gosselin and Leeza Gibbons on the set of 'Celebrity Apprentice' on April 1, 2014 in New York City. (Photo by Bobby Bank/GC Images)
NEW YORK, NY - APRIL 05: Kate Gosselin seen filming 'Celebrity Apprentice' on April 5, 2014 in New York City. (Photo by Alessio Botticelli/GC Images)
CELEBRITY APPRENTICE -- Episode 1401 -- Pictured: (l-r) Keshia Knight Pulliam, Leeza Gibbons, Kate Gosselin, Kenya Moore, Vivica A Fox, Brandi Glanville, Shawn Johnson, Jamie Anderson -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - MARCH 25: Kate Gosselin on the set of 'Celebrity Apprentice' on March 25, 2014 in New York City. (Photo by Bobby Bank/WireImage)
CELEBRITY APPRENTICE -- Episode 1401 -- Pictured: (l-r) Jamie Anderson, Kate Gosselin, Kenya Moore -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
CELEBRITY APPRENTICE -- Episode 1401 -- Pictured: (l-r) Kate Gosselin, Jamie Anderson, Keshia Knight Pulliam, Leeza Gibbons, Kenya Moore, Viviva A. Fox, Shawn Johsnon, Brandi Glanville -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
TODAY -- Pictured: (l-r) Cara Gosselin, Kate Gosselin, Mady Gosselin and Savannah Guthrie appear on NBC News' 'Today' show -- (Photo by: Peter Kramer/NBC/NBC NewsWire via Getty Images)
TODAY -- Pictured: (l-r) Cara Gosselin, Kate Gosselin and Mady Gosselin appear on NBC News' 'Today' show -- (Photo by: Peter Kramer/NBC/NBC NewsWire via Getty Images)
TORONTO, ON - OCTOBER 1: Kate Gosselin, former reality star and long time target of the tabloids, now author of new cookbook called Love Is In The Mix in Toronto to promote the book. Toronto, October 1, 2013. (Colin McConnell/Toronto Star via Getty Images)
TORONTO, ON - OCTOBER 01: Reality TV Star Kate Gosselin Appears On CTV's 'The Marilyn Denis Show' at Bell Media Headquarters on October 1, 2013 in Toronto, Canada. (Photo by George Pimentel/WireImage)
NEW YORK, NY - SEPTEMBER 26: Bethenny hosts Kate Gosselin, Loni Love, Michael Yo, Jenny Mollen, and Maksim Chmerkovskiy at the CBS Broadcast Center on September 26, 2013 in New York City. (Photo by Neilson Barnard/Getty Images for 'bethenny')
NEW YORK, NY - SEPTEMBER 25: Kate Gosselin visits SiriusXM Studios on September 25, 2013 in New York City. (Photo by Robin Marchant/Getty Images)
NEW YORK, NY - SEPTEMBER 25: AJ Calloway (L) interviews TV personality Kate Gosselin during her visit to 'Extra' in Times Square on September 25, 2013 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
LAS VEGAS - DECEMBER 2: Television personality Kate Gosselin (L) and a performer from 'KA by Cirque du Soleil' arrive at the Zappos.com Rock 'n' Roll Las Vegas Marathon on December 2, 2012 in Las Vegas, Nevada. (Photo by Isaac Brekken/Getty Images for Rock 'n' Roll Marathon)
LAS VEGAS, NV - DECEMBER 02: Television personality Kate Gosselin arrives at the Zappos.com Rock 'n' Roll Las Vegas Marathon and Half-Marathon on December 2, 2012 in Las Vegas, Nevada. (Photo by Jeff R. Bottari/Getty Images)
NEW YORK, NY - SEPTEMBER 12: TV personality Kate Gosselin attends the 'Real Fashion, Real Women' Runway Show Benefiting Bottomless Closetat Empire Hotel on September 12, 2012 in New York City. (Photo by Taylor Hill/Getty Images)
NEW YORK, NY - SEPTEMBER 12: TV personality Kate Gosselin attends the 'Real Fashion, Real Women' Runway Show Benefiting Bottomless Closetat Empire Hotel on September 12, 2012 in New York City. (Photo by Taylor Hill/Getty Images)
NEW YORK, NY - SEPTEMBER 12: TV personality Kate Gosselin walks the runway during the Derek Warburton 'Real Fashion, Real Women' Benefit during Spring 2013 Mercedes-Benz Fashion Week at Empire Hotel on September 12, 2012 in New York City. (Photo by Randy Brooke/WireImage)
NEW YORK, NY - AUGUST 03: Kate Gosselin attends BlogHer '12 at the Hilton New York on August 3, 2012 in New York City. (Photo by Laura Cavanaugh/Getty Images)
CHICAGO, IL - JULY 22: Kate Gosselin takes part in the 2012 Rock 'n' Roll Chicago Half Marathon at Grant Park on July 22, 2012 in Chicago, Illinois. (Photo by Timothy Hiatt/Getty Images)
TODAY -- Pictured: Kate Gosselin appears on NBC News' 'Today' show -- (Photo by: Peter Kramer/NBC/NBC NewsWire via Getty Images)
TODAY -- Pictured: Kate Gosselin appears on NBC News' 'Today' show (Photo by Peter Kramer/NBC/NBCU Photo Bank via Getty Images)
TODAY -- Pictured: Kate Gosselin appears on NBC News' 'Today' show (Photo by Peter Kramer/NBC/NBCU Photo Bank via Getty Images)
LOUISVILLE, KY - MAY 07: Kate Gosselin attends the 137th Kentucky Derby at Churchill Downs on May 7, 2011 in Louisville, Kentucky. (Photo by Michael Hickey/WireImage)
LOUISVILLE, KY - MAY 06: Kate Gosselin attends the Style Icon 2011 Luxury Gifting Suite at the Galt House - Day 1 at the Galt House Hotel & Suites Grand Ballroom on May 6, 2011 in Louisville, Kentucky. (Photo by Jeff Gentner/Getty Images for Style Icon)
NEW YORK CITY - MARCH 18: Kate Gosselin sighting at STK restaurant on March 18, 2011 in New York City. (Photo by Christopher Peterson/BuzzFoto/FilmMagic)
TV personality Kate Gosselin arrives at the 62nd Primetime Emmy Awards at Nokia Plaza L.A. LIVE on August 29, 2010 in Los Angeles, California.
TODAY -- Pictured: Kate Gosselin appears on NBC News' 'Today' show (Photo by Peter Kramer/NBC/NBCU Photo Bank via Getty Images)
Kate Gosselin sighting at ABC Studios on April 23, 2010 in New York City.
DANCING WITH THE STARS THE RESULTS SHOW - 'Episode 1010A' - In the two-hour finale on TUESDAY, MAY 25 (9:00-11:00 p.m., ET), all previously eliminated couples returned to perform all-new dance routines. (Photo by Adam Larkey/ABC via Getty Images) KATE GOSSELIN, TONY DOVOLANI
DANCING WITH THE STARS - 'Episode 1005' - This week on 'Dancing with the Stars,' it was movie night, with eight remaining couple doing the Jive, Quickstep, Cha Cha Cha, Tango, Foxtrot and Rumba to iconic songs from famous films such as 'Pulp Fiction,' 'Breakfast Club' and 'Risky Business,' among others, airing MONDAY, APRIL 19 (8:00-9:32 p.m.,ET), on the ABC Television Network. (Photo by Adam Larkey/ABC via Getty Images) TONY DOVOLANI, KATE GOSSELIN
DANCING WITH THE STARS - In week five of 'Dancing with the Stars,' the remaining couples return to the stage, MONDAY, APRIL 19 (8:00-9:32 p.m., ET), on the ABC Television Network. (Photo by Greg Zabilski/ABC via Getty Images) TONY DOVOLANI, KATE GOSSELIN
TV personality Kate Gosselin poses at Kate Gosselin Signs Copies Of 'I Just Want You to Know: Letters To My Kids' at Barnes & Noble 3rd Street Promenade on April 16, 2010 in Santa Monica, California. (Photo by Jon Kopaloff/FilmMagic)
THE TONIGHT SHOW WITH JAY LENO -- Episode 3808 -- Pictured: Television personality Kate Gosselin during an interview on April 15, 2010 -- Photo by: Paul Drinkwater/NBCU Photo Bank
DANCING WITH THE STARS - In week three of 'Dancing with the Stars,' the remaining couples return to the stage, MONDAY, APRIL 5 (8:00-10:02 p.m., ET), on the ABC Television Network. (Photo by Kelsey McNeal/ABC via Getty Images) KATE GOSSELIN, TONY DOVOLANI, BROOKE BURKE
NEW YORK - MARCH 04: TV personality Kate Gosselin attends the after party for the premiere of Discovery Channel's 'Life' at Alice Tully Hall, Lincoln Center on March 4, 2010 in New York City. (Photo by Stephen Lovekin/Getty Images)
LONG BEACH, CA - OCTOBER 26: Kate Gosselin signs copies of her book Eight Little Faces at the 2009 Women's Conference - Day 1 at Long Beach Convention Center on October 26, 2009 in Long Beach, California. (Photo by Dr. Billy Ingram/Getty Images)
TODAY -- Aired 10/05/2009 -- Pictured: Kate Gosselin -- In an exclusive interview with NBC News' Meredith Vieira, Kate Gosselin speaks out about the suspension of her reality show, her messy split with her husband, Jon, and reports that he took thousands of dollars out of their joint bank account (Photo by Virginia Sherwood/NBC/NBCU Photo Bank via Getty Images)
DANBURY, CT - SEPTEMBER 26: Kate Gosselin of 'John and Kate Plus 8' reality TV on TLC introduces ice skaters during the 8th annual Stars, Stripes & Skates to benifit the Heritage Foundation of 9/11, September 26, 2009 in Danbury, Connecticut. (Photo by Douglas Healey/Getty Images)
BEVERLY HILLS, CA - AUGUST 25: Kate Gosselin sighting at CNN news building on August 25, 2009 in Beverly Hills, California. (Photo by David Aguilera/BuzzFoto/FilmMagic) *** Local Caption ***
TODAY -- Airdate 08/10/2009 -- Meredith Vieira interviews Kate Gosselin of 'Jon and Kate plus 8' -- Pictured: Kate Gosselin (Photo by Lisa Berg/NBC/NBCU Photo Bank via Getty Images)
NEW YORK - AUGUST 10: Kate Gosselin visits FAO Schwarz on August 10, 2009 in New York City. (Photo by James Devaney/WireImage) *** Local Caption ***
GLENDALE, CA - APRIL 14: Kate Gosselin signs copies of her new book 'Eight Little Faces' and her New York Times Bestselling book, 'Multiple Blessings' at the Barnes & Noble in Americana at Brand on April 14, 2009 in Glendale, California. (Photo by Michael Kovac/FilmMagic)
GLENDALE, CA - APRIL 14: Kate Gosselin signs copies of her new book 'Eight Little Faces' and her New York Times Bestselling book, 'Multiple Blessings' at the Barnes & Noble in Americana at Brand on April 14, 2009 in Glendale, California. (Photo by Michael Kovac/FilmMagic)
NEW YORK - APRIL 2: (L-R) Television personalities Jon Gosselin and Kate Gosselin of TLC's 'Jon & Kate Plus 8' and Buddy Valastro of TLC's 'Cake Boss' attend Discovery Upfront at Jazz at Lincoln Center April 2, 2009 in New York City. (Photo by Amy Sussman/WireImage for Discovery Communications)
NEW YORK - APRIL 02: Kate Gosselin and Jon Gosselin attend Discovery Upfront at Jazz at Lincoln Center on April 2, 2009 in New York City. (Photo by Brad Barket/WireImage for Discovery Communications)
TODAY -- Pictured: (l-r) Kate Gosselin and John Gosselin speak with News Anchor Ann Curry about their twin daughters and sextuplets on NBC News' 'Today' on October 2, 2007 -- Photo by: Heidi Gutman/NBC NewsWire
TODAY -- Pictured: (l-r) Kate Gosselin and John Gosselin talk about their twin daughters and sextuplets on NBC News' 'Today' on October 2, 2007 -- Photo by: Heidi Gutman/NBC NewsWire
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WATCH: Kate Gosselin Reveals 12-Year-Old Son Collin Is Away Getting Help for 'Special Needs'

On Monday's episode, Kate got emotional as she reflected on her son's absence after the family sang "Happy Birthday" and snapped family pictures next to the cakes.

"The photos around the cake, I have them for every year, every child, every birthday. We always have the big birthday party at home on their birthday, [I] got 'em for every year," Kate shared. "This year [was] much like last year, obviously the difference is that Collin wasn't there."

"I am comforted with the fact that my kids, all of them, each unique child, is receiving exactly what they need and that hasn't changed," she continued. "I've said that before, I'll say it again. It's a bittersweet moment [and] we've had many of them. You can't do anything without realizing he's missing, so we may not say it, but it's always there."

For more from Kate on her difficult decision to enroll her son in a special needs program, watch the video below.

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