Jon Gosselin wishes sextuplets a happy 15th birthday, poses with Collin and Hannah

Jon Gosselin took time out to wish his children a happy birthday on Instagram on Friday with a sweet message.

The 42-year-old reality star's sextuplets with his ex-wife, Kate -- Hannah, Collin, Alexis, Aaden, Joel and Leah -- turned 15 on May 10. The exes -- who rose to fame with their TLC show, Jon & Kate Plus 8 -- also share 18-year-old twins Cara and Mady.

"Happy 15th Birthday Hannah, Collin, Alexis, Aaden, Joel and Leah!!!!" Gosselin wrote, alongside pics of him posing with Hannah and Collin. "Wow I can’t believe you are 15!!! Time is flying by!!! I love you all very much. I wish you the best day ever and I hope you enjoy your birthday celebrations today and this weekend!!! Love always, Dad."

Hannah lives with Gosselin, and he was granted temporary sole custody of Collin on Dec. 4, 2018. He told E! News that month that the other four sextuplets weren't speaking to him.

ET spoke to the reality star turned DJ last December at a WE tv event, where he talked about also being estranged from his twin daughters.

"I hope my relationship with Mady and Cara will get better but they're adults now, so that just kind of hinges on them and I kind of, you know, being estranged from them, I’ve kind of learned to live with it,” he said. "But it's really up to them to decide what they want to do with that."

"I kind of left it in their court now since it's been so long," he continued. "I mean, it is kind of heartbreaking and I do miss them, but everyone grows and matures and understands things... I tried really hard to develop something with them and only time will tell, I guess."

Gosselin also talked to ET about possibly remarrying when it comes to his girlfriend, Colleen Conrad, whom he's been dating since 2015.

23 PHOTOS
Gosselin kids through the years
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Gosselin kids through the years
Had a good weekend visit with Collin at home!
This was yesterday! Feels like school never ended...and they’re already back! #SeniorYear 😳😳 #EighthGrade #ProudMom ❤️
My adult😳 daughters: @mady.gosselin and @cara.gosselin (FYI: these are their ONLY official IG accounts) #SoProud What a fun memory filled day we had together today!!😘😘
My beautiful 'little girls' .... they keep reminding me how many days until they turn 14. Today it was '12 days til we turn 14, Mom.' HOW'S THAT EVEN POSSIBLE?! I told Leah that she's too small to turn 14. She said 'Yeah, true. Are you sure I'm not turning 11 or 12?' 😂😂I'm positive. I gave birth to you. They'll always be my babies....I love them so very much! ♥️♥️♥️
fall family pictures🍂🎃 #tradition #7/8reunion🧡
Glad I could celebrate my son Collin’s 14th birthday with him and his sister!
Bday dinner with Hannah. Happy Birthday!!!
Happy 14th Birthday to Hannah, Leah, Alexis, Joel, Aaden and Collin!!! I can’t believe it’s been this long!!! Whew that when fast!!! Daddy loves you all very much!!!
Happy Birthday Hannah!!! 14 already. Bday breakfast with my daughter before the bus stop!!!
Happy 17th Birthday Mady and Cara!!! Love you, Dad
Happy New Year!!! 2017!!! Let's do this!!!!
Found this old pic from Hawaii, 2008!!! Kids were 4!
Happy 16th Bday to Mady and Cara!!! ❤️❤️👭🎂🎂October 8, 2000 seems forever ago.
Credit: TLC
Credit: TLC
Credit: TLC
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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