During Thursday night's episode of "Watch What Happens Live," Kelly Clarkson made a confession that has our teenage selves totally freaking out -- and if you guessed it has something to do with her "American Idol" partner in crime Justin Guarini, you're totally right.
kelly clarkson justin guarini
Kelly Clarkson confirms she dated Justin Guarini
Justin Guarini and Kelly Clarkson during 'Good Morning America's' 2003 Concert Series - Justin Guarini and Kelly Clarkson at Bryant Park in New York City, New York, United States. (Photo by Debra L Rothenberg/FilmMagic)
Kelly Clarkson and Justin Guarini during Kelly Clarkson and Justin Guarini Stop By MTV's 'Spankin' New Summer Music' Week at MTV Summer Beach House in East Quogue, New York, United States. (Photo by Dimitrios Kambouris/WireImage)
Kelly Clarkson & Justin Guarini during Nickelodeon's 16th Annual Kids' Choice Awards 2003 - Press Room at Barker Hanger in Santa Monica, California, United States. (Photo by Jeffrey Mayer/WireImage)
Kelly Clarkson & Justin Guarini during 'American Idol' Season 1 Finale - Results Show at Kodak Theatre in Hollywood, California, United States. (Photo by SGranitz/WireImage)
In this image provided by the Boy Scouts of America, singer/songwriter/actor Justin Guarini, a former Cub Scout, performs during the BSA Grand Centennial Parade, Sunday, July 25, 2010, in Washington. The Boy Scouts of America are celebrating 100 years of Scouting in the nation's capital as a kick-off to their National Jamboree being held at Fort AP Hill, Va., beginning July 26, 2010. (AP Photo/Boy Scouts of America, John Harrington)
Justin Guarini arrives at the Grammy Awards on Sunday, Jan. 31, 2010, in Los Angeles. (AP Photo/Chris Pizzello)
New Jersey Devils team captain Scott Stevens, left, appears with the Stanley Cup on "Live with Regis and Kelly," in New York Thursday June 12, 2003. "American Idol " runner-up Justin Guarini, center, was the co-host with Ripa in place of Regis Philbin. (AP Photo/Richard Drew)
Kelly Clarkson, 20, of Burleson, Texas, left, and Justin Guarini, 23, of Doylestown, Pa. perform during the final episode of Fox's television competition "American Idol," in Los Angeles, Wednesday, Sept. 4, 2002. The winner earns a recording contract, and will release a CD single later this month and a full album in November. (AP Photo/Lucy Nicholson)
Kelly Clarkson, 20, right, and Justin Guarini, 23, hug after a sing-off between the two finalists for the title of "American Idol," in Los Angeles, Tuesday, Sept. 3, 2002. The winner will be announced in the television show's finale on Wednesday after a phone-in vote, and rewarded with a RCA Records recording contract. (AP Photo/Lucy Nicholson)
NEW YORK, NY - MARCH 22: Justin Guarini, Keith Carradine, Alexandra Socha and cast during the The Encores! 'Paint Your Wagon' closing night curtain call at City Center on March 22, 2015 in New York City. (Photo by Walter McBride/Getty Images)
NEW YORK, NY - JUNE 08: Host Justin Guarini performs onstage during the 68th Annual Tony Awards Times Square Simulcast at Times Square on June 8, 2014 in New York City. (Photo by Slaven Vlasic/Getty Images for Tony Awards Productions)
NEW YORK, NY - JULY 10: (L-R) Justin Guarini and Chrstine Dwyer from the cast of Wicked perform during 106.7 LITE FM's Broadway in Bryant Park 2014 at Bryant Park on July 10, 2014 in New York City. (Photo by Janette Pellegrini/Getty Images)
NEW YORK, NY - AUGUST 24: Justin Guarini attends the 'Romeo And Juliet' On Broadway First Performance at the Richard Rodgers Theatre on August 24, 2013 in New York City. (Photo by Paul Zimmerman/Getty Images)
NEW YORK, NY - SEPTEMBER 19: Corey Hawkins, Roslyn Ruff, Christian Camargo, Jayne Houdyshell, Orlando Bloom, Condola Rashad, Brent Carver, Chuck Cooper, Conrad Kemp and Justin Guarini during the 'Romeo And Juliet' Broadway Opening Night Curtain Call at Richard Rodgers Theatre on September 19, 2013 in New York City. (Photo by Walter McBride/WireImage)
Singer/songwriter Justin Guarini attends the day one GRAMMY gift lounge during The 53rd Annual GRAMMY Awards at Staples Center on February 10, 2011 in Los Angeles, California.
NEW YORK, NY - FEBRUARY 18: Justin Guarini and Ben Vereen attend Ben Vereen's portrait unveiling at Tony's di Napoli on February 18, 2011 in New York City. (Photo by Wendell Teodoro/WireImage)
NEW YORK, NY - FEBRUARY 07: (L-R) Justin Guarini, Patti LuPone and Laura Benanti pose at the Drama League's 27th Annual All-Star Benefit Gala honoring Patti LuPone at The Pierre Hotel on February 7, 2011 in New York City. (Photo by Bruce Glikas/FilmMagic)
NEW YORK, NY - APRIL 12: *EXCLUSIVE COVERAGE* (L-R) Katie Holmes, Justin Guarini and Tom Cruise pose backstage at the hit musical written by Green Day 'American Idiot' on Broadway at The St. James Theater on April 12, 2011 in New York City. (Photo by Bruce Glikas/FilmMagic)
PHILADELPHIA, PA - NOVEMBER 24: Justin Guarini attends the 92nd Annual 6ABC Dunkin' Donuts Thanksgiving Day Parade on November 24, 2011 in Philadelphia, Pennsylvania. (Photo by Gilbert Carrasquillo/Getty Images)
LOS ANGELES, CA - JANUARY 28: TV Personality Justin Guarini attends the 52nd Annual GRAMMY Awards GRAMMY Gift Lounge Day 1 held at the Staples Center on January 28, 2010 in Los Angeles, California. (Photo by Jordin Althaus/WireImage)
WEST HOLLYWOOD, CA - JANUARY 14: Recording artist Justin Guarini poses with Sorbee sugar free candy at the Hollywood Helping Haiti Golden Globes Celebrity & Charity Lounge - Day 1 at House of Blues Sunset Strip on January 14, 2010 in West Hollywood, California. (Photo by Tiffany Rose/WireImage)
LOS ANGELES, CA - SEPTEMBER 18: TV personality Justin Guarini attends the Kari Feinstein Primetime Emmy Awards style lounge at Zune LA on September 18, 2009 in Los Angeles, California. (Photo by Rebecca Sapp/WireImage)
PHILADELPHIA - NOVEMBER 27: Singer Justin Guarini, of Doylestown, Pennsylvania waves to the crowd during the 6ABC/IKEA Thanksgiving Day Parade November 27, 2008 in Philadelphia, Pennsylvania. The Philadelphia Parade is the oldest Thanskgiving Day parade in the country. (Photo by William Thomas Cain/Getty Images)
LOS ANGELES, CA - FEBRUARY 07: Kimberly Caldwell and Justin Guarini attend the 51st Annual GRAMMY Awards Gift Lounge at the Staples Center on February 7, 2009 in Los Angeles, CA. (Photo by Jesse Grant/WireImage)
UNIVERSAL CITY, CALIFORNIA - AUGUST 26: TV Personality Justin Guarini in the press room at the 2007 Teen Choice Awards at Gibson Amphitheater on August 26, 2007 in Universal City, California. (Photo by Jeffrey Mayer/Jeffrey Mayer)
CULVER CITY, CA - OCTOBER 19: Singer Justin Guarini poses with the Gran Centenario angel during Mercedes Benz Fashion Week held at Smashbox Studios on October 19, 2006 in Culver City, California. (Photo by Amanda Edwards/Getty Images for Gran Centenario)
LOS ANGELES, CA - SEPTEMBER 26: Singer Justin Guarini performs inside the cocktail party celebrating 'American Idol Rewind' at Spyder Club on September 26, 2006 in Los Angeles, California. (Photo by Michael Buckner/Getty Images)
Justin Guarini at the Club Shelter in West Hollywood, CA (Photo by Albert L. Ortega/WireImage)
Justin himself recently confirmed the relationship during his one-man cabaret act, appropriately dubbed "Lovesick."
We totally didn't believe it until Kelly put in her two cents, though -- and just when we thought we'd had enough of 2003 for the night, Andy Cohen and Kelly decided to reenact a scene from the very movie where the former lovebirds started dating.
Do we smell a "From Justin to Kelly" sequel? Fans on Twitter were absolutely loving the Justin Guarini blast from the past.