Kelly Clarkson hilariously forgets the lyrics to her own songs while on Facebook Live

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Kelly Clarkson needs a refresher course on her own songs.

During a rehearsal on Friday, the 34-year-old singer went on Facebook live to sing a few of her hits for her fans, but couldn't seem to remember her own lyrics.

WATCH: Kelly Clarkson Sings Live for First Time After Going on Vocal Rest

She started her mini performance with "Catch My Breath," but flubbed the lyrics before admitting she wrote the song. Before singing "Beautiful Disaster," Clarkson asked for a line, and later had to immediately jump to the chorus of "Cry" because she couldn't remember all the words. "There's a lot of songs," Clarkson exclaimed. "It's been 15 years."

Whenever she couldn't recall a word in the song, Clarkson would replace it with "something." The mother of two nearly got through "Already Gone" before she flubbed. "I'm going to get so much crap for this!" she quipped. "This is the worst idea."

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"Walk Away" started out well, but she forgot the second line. "Dear Lord, I don't know lyrics!" she said. "This is hard! I'm sweating!"

For her last song, Clarkson sang "A Moment Like This," which was the song she performed after winning American Idol in 2002 -- but again, she couldn't remember all the words. "You're welcome for the comedy hour," Clarkson joked. "Sorry I didn't know my lyrics."

Looks like rehearsal is necessary.

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ET has been with Clarkson since the start of career. "What I want to achieve is, I want longevity," she shared in 2002 when she was just 20. "I want to be able to reach different crowds, different ages. I want to be the type of performer that people, you know, backstage I can actually sit there and talk to them. I want to take time out."

Clarkson has clearly surpassed her goal, with too many hit songs for even her to remember.

Kelly Clarkson through the years:

45 PHOTOS
Kelly Clarkson through the years - 2015- Idol days
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Kelly Clarkson through the years - 2015- Idol days
NEW YORK, NY - NOVEMBER 03: Kelly Clarkson attends Citizen Watch Company's New York Corporate Offices Grand Opening at Citizen Watch Company Corporate Offices on November 3, 2015 in New York City. (Photo by Rob Kim/Getty Images)
HOLLYWOOD, CA - APRIL 1: Singer Kelly Clarkson performs onstage at FOX's 'American Idol XIV' Top 8 Revealed on April 1, 2015 in Hollywood, California. (Photo by Michael Becker/FOX via Getty Images)
Photo by: KGC-03/STAR MAX/IPx ©2015 6/6/15 Kelly Clarkson at the Capital FM Summertime Ball at Wembley Stadium. (London, England, UK)
NEW YORK, NY - MARCH 03: Kelly Clarkson arriving for an appearance at Good Morning America on March 03, 2015 in New York City. (Photo by MPI02/Bauer-Griffin/GC Images)
Kelly Clarkson during filming of the Graham Norton Show at the London Studios, in central London.
NEW YORK, NY - MARCH 05: (EXCLUSIVE COVERAGE) Singer Kelly Clarkson visits the SiriusXM Studios on March 5, 2015 in New York City. (Photo by Cindy Ord/Getty Images)
NEW YORK, NY - MARCH 02: Kelly Clarkson gives an exclusive performance at iHeartRadio Theater on March 2, 2015 in New York City. (Photo by Cindy Ord/Getty Images for iHeart Radio)
NEW YORK, NY - MARCH 03: Kelly Clarkson performs on SiriusXM Hits 1 at SiriusXM Studio on March 3, 2015 in New York City. (Photo by Robin Marchant/Getty Images for SiriusXM)
NEW YORK, NY - FEBRUARY 28: (EXCLUSIVE COVERAGE) (L-R) Carly Hughes as'Velma Kelly', Kelly Clarkson and Jennifer Nettles as 'Roxie Hart' pose backstage at 'Chicago' on Broadway at The Ambassador Theater on February 28, 2015 in New York City. (Photo by Bruce Glikas/FilmMagic)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0221 -- Pictured: (l-r) Host Jimmy Fallon and singer Kelly Clarkson during the 'History of Duets' bit on March 2, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
LONDON, UNITED KINGDOM - FEBRUARY 19: Kelly Clarkson seen arriving at the Capital FM Studios on February 19, 2015 in London, England. (Photo by Neil Mockford/Alex Huckle/GC Images)
LONDON, UNITED KINGDOM - FEBRUARY 17: Kelly Clarkson seen arriving at the BBC Radio 1 Studios on February 17, 2015 in London, England. (Photo by Neil Mockford/Alex Huckle/GC Images)
NASHVILLE, TN - DECEMBER 20: (EXCLUSIVE COVERAGE) Kelly Clarkson performs during Kelly Clarkson Miracle On Broadway - A Benefit Concert at Bridgestone Arena on December 20, 2014 in Nashville, Tennessee. (Photo by Justin McIntosh/Getty Images for Starstruck Entertainment)
NASHVILLE, TN - DECEMBER 20: (EXCLUSIVE COVERAGE) Kelly Clarkson performs during Kelly Clarkson Miracle On Broadway - A Benefit Concert at Bridgestone Arena on December 20, 2014 in Nashville, Tennessee. (Photo by Justin McIntosh/Getty Images for Starstruck Entertainment)
NASHVILLE, TN - DECEMBER 15: Miranda Lambert, Reba McEntire, and Kelly Clarkson perform at the 2014 American Country Countdown Awards at Music City Center on December 15, 2014 in Nashville, Tennessee. (Photo by Jason Merritt/Getty Images for dcp)
ORLANDO, FL - FEBRUARY 21: Kelly Clarkson performs during Mardi Gras celebration at Universal Orlando on February 21, 2015 in Orlando, Florida. (Photo by Gerardo Mora/Getty Images)
NEW YORK, NY - NOVEMBER 19: Kelly Clarkson performs with young fans at Citizen Watch Company Global Flagship Store Opening at Citizen Watch Company Global Flagship Store on November 19, 2014 in New York City. (Photo by Rob Kim/Getty Images)
NEW YORK, NY - NOVEMBER 18: Kelly Clarkson speaks onstage at Musicians On Call Celebrates Its 15th Anniversary Honoring Kelly Clarkson and EVP of Republic Records, Charlie Walk on November 18, 2014 in New York City. (Photo by Neilson Barnard/Getty Images for Musicians On Call)
NEW YORK, NY - NOVEMBER 18: Kelly Clarkson and Executive Vice President Of Republic Records, Charlie Walk attend Musicians On Call Celebrates Its 15th Anniversary Honoring Kelly Clarkson and EVP of Republic Records, Charlie Walk on November 18, 2014 in New York City. (Photo by Larry Busacca/Getty Images for Musicians On Call)
NASHVILLE, TN - SEPTEMBER 09: Kelly Clarkson performs at the 8th Annual ACM Honors at the Ryman Auditorium on September 9, 2014 in Nashville, Tennessee. (Photo by Jason Davis/Getty Images for ACM)
LATE NIGHT WITH JIMMY FALLON -- Episode 943 -- Pictured: Musical guest Kelly Clarkson sings 'Underneath the Tree' on Thursday, December 12, 2013 -- (Photo by: Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images)..
NEW YORK, NY - OCTOBER 10: Kelly Clarkson performs for the 'People Like Us' Fair Trade Concert at Highline Ballroom on October 10, 2013 in New York City. (Photo by Dave Kotinsky/Getty Images)
NEW YORK, NY - OCTOBER 10: Kelly Clarkson performs for the 'People Like Us' Fair Trade Concert at Highline Ballroom on October 10, 2013 in New York City. (Photo by Dave Kotinsky/Getty Images)
NEW YORK, NY - OCTOBER 10: Musicians Kelly Clarkson (L) and will.i.am speak onstage at the 2013 American Music Awards Nominations Press Conference at B.B. King Blues Club & Grill on October 10, 2013 in New York City. (Photo by Neilson Barnard/FilmMagic)
THE VIEW - (10.9.13) Today's guest co-host is Bobby Flay. Guests include Kelly Clarkson: Sophie Lowe and Michael Socha (ABC's 'Once Upon A Time in Wonderland') today on ABC's 'The View.' 'The View' airs Monday-Friday (11:00 am-12:00 noon, ET) on the ABC Television Network. (Photo by Lou Rocco/ABC via Getty Images) KELLY CLARKSON, SHERRI SHEPHERD
NEW YORK, NY - OCTOBER 08: Singer Kelly Clarkson visits the SiriusXM Studios on October 8, 2013 in New York City. (Photo by Taylor Hill/Getty Images)
LAS VEGAS, NV - APRIL 07: Singer Kelly Clarkson performs onstage during the 48th Annual Academy of Country Music Awards at the MGM Grand Garden Arena on April 7, 2013 in Las Vegas, Nevada. (Photo by Kevin Winter/ACMA2013/Getty Images for ACM)
LAS VEGAS, NV - APRIL 07: Singer Kelly Clarkson attends the 48th Annual Academy of Country Music Awards at the MGM Grand Garden Arena on April 7, 2013 in Las Vegas, Nevada. (Photo by Frazer Harrison/ACMA2013/Getty Images for ACM)
LOS ANGELES, CA - FEBRUARY 10: Singer Kelly Clarkson accepts Best Pop Vocal Album award for 'Stronger' onstage at the 55th Annual GRAMMY Awards at Staples Center on February 10, 2013 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)
NEW ORLEANS, LA - FEBRUARY 09: Mardi Gras reigning celebrity grand marshal Kelly Clarkson performs on stage before the 2013 Krewe Of Endymion Parade on February 9, 2013 in New Orleans, Louisiana. (Photo by Skip Bolen/Getty Images)
LOS ANGELES, CA - DECEMBER 16: Singer Kelly Clarkson performs onstage during 'VH1 Divas' 2012 at The Shrine Auditorium on December 16, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images)
LOS ANGELES, CA - NOVEMBER 18: Singer Kelly Clarkson performs onstage during the 40th American Music Awards held at Nokia Theatre L.A. Live on November 18, 2012 in Los Angeles, California. (Photo by Christopher Polk/AMA2012/Getty Images for AMA)
HOLMDEL, NJ - AUGUST 26: Singer Kelly Clarkson performs at the PNC Bank Arts Center on August 26, 2012 in Holmdel, New Jersey. (Photo by Paul Zimmerman/Getty Images)
CONCORD, CA - JULY 25: Kelly Clarkson performs in support of her Stronger release at Sleep Train Pavilion on July 25, 2012 in Sacramento, California. (Photo by Tim Mosenfelder/Getty Images)
DUETS - 'The Finale' - The votes have been tallied and a winner was revealed in the very special, live finale episode of 'Duets.' But before America's votes were announced, the Superstars and their partners took to the stage and performed together one last time. Hosted by Quddus, the series is a one-of a kind singing competition that takes the Superstars out from behind the judges' panel and onto the stage. The winner of the competition will receive a recording contract with Hollywood Records. The Season Finale of 'Duets' airs THURSDAY, JULY 19 (8:00-9:00 p.m., ET) on the ABC Television Network. Photo by Kelsey Mcneal /ABC via Getty Images KELLY CLARKSON
DUETS - 'After Party: Duets' - 'Duets' aired live this THURSDAY, JUNE 28 (8:00-9:00 p.m, ET), and the party did not end when the show signed off for the night! Fans could go to ABC.com/Duets immediately following the show to see a special live streaming 'After Party: Duets' event hosted by Quddus from a fully wired, custom built music lounge. (Photo by Kelsey McNeal/ABC via Getty images) ROBIN THICKE, KELLY CLARKSON
US singer Kelly Clarkson performs during the Pop Music Festival 2012 at Arena Anhembi in Sao Paulo, Brazil, on June 23, 2012. AFP PHOTO/Yasuyoshi CHIBA (Photo credit should read YASUYOSHI CHIBA/AFP/GettyImages)
TORONTO, ON - JUNE 17: Kelly Clarkson perfoms at the 2012 MuchMusic Video Awards at MuchMusic HQ on June 17, 2012 in Toronto, Canada. (Photo by George Pimentel/WireImage)
LAS VEGAS, NV - MAY 20: (EXCLUSIVE COVERAGE) Singer Kelly Clarkson performs onstage at the 2012 Billboard Music Awards at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Kevin Mazur/WireImage)
'American Idol' Season 1 winner Kelly Clarkson performing 'Never Again' (Photo by Lester Cohen/WireImage)
LONDON - FEBRUARY 22: American Idol winner Kelly Clarkson plays the London stop of her first UK tour at the Carling Apollo Hammersmith on February 22, 2006 in London, England. (Photo by Jo Hale/Getty Images)
HOLLYWOOD - MAY 26: Singer Kelly Clarkson poses backstage at the American Idol Season Three Grand Finale at the Kodak Theatre May 26, 2004 in Hollywood, California. (Photo by Robert Bertoia/Getty Images)
Kelly Clarkson during 'American Idol' Season 3 Finale - Results Show at Kodak Theatre in Hollywood, California, United States. (Photo by Ray Mickshaw/WireImage)
UNSPECIFIED - SEPTEMBER 10: HUIZEN Photo of Kelly CLARKSON, Posed portrait of American Idol winner Kelly Clarkson (Photo by Rob Verhorst/Redferns)
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