Scott Eastwood reveals shocker about Ashton Kutcher & Demi Moore's divorce

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Scott Eastwood Shocker: Says Ashton Cheated on Demi With His Girlfriend

The Longest Ride star Scott Eastwood dropped a major bombshell about what may have led to Ashton Kutcher and Demi Moore's divorce.

Things got interesting on Thursday's Watch What Happens Live when a caller asked fellow guest Jon Cryer if it was awkward working with Kutcher on Two and a Half Men, since they had both been in relationships with Moore. Cryer dated Moore in the 1980s, while Kutcher was married to her from 2005-13.

WATCH: Jon Cryer on Dating Demi Moore in the 1980s

"Yeah it was a little awkward I have to say," Cryer began to answer, before Eastwood chimed in with his own shocking revelation.

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Scott Eastwood reveals shocker about Ashton Kutcher & Demi Moore's divorce
HOLLYWOOD, CA - APRIL 8: Demi Moore and Ashton Kutcher arrive at 'The Joneses' Los Angeles Premiere at the Arclight Hollywood on April 8, 2010 in Hollywood, California. (Photo by Gregg DeGuire/FilmMagic)
BEVERLY HILLS, CA - FEBRUARY 20: Actor Scott Eastwood attends the 52nd Annual ICG Publicists Awards at The Beverly Hilton Hotel on February 20, 2015 in Beverly Hills, California. (Photo by George Pimentel/WireImage)
Ashton Kutcher and Demi Moore during Center Dance Art's Pool Party Sponsored by Yves Saint Laurent - Inside Cocktail at Beverly Hills Hotel in Beverly Hills, California, United States. (Photo by Donato Sardella/WireImage)
BEVERLY HILLS, CA - SEPTEMBER 28: Actress Demi Moore (L) and boyfriend actor Ashton Kutcher (R) arrive for the opening of the Stella McCartney Store September 28, 2003 in Beverly Hills, California. The store is a high end fashion store that caters to the Hollywood elite. (Photo by Carlo Allegri/Getty Images)
Actress Demi Moore and husband actor Ashton Kutcher arrive at the 7th Annual Chrysalis Butterfly Ball at a private residence on May 31, 2008 in Brentwood, California. (Photo by Jon Kopaloff/FilmMagic)
Ashton Kutcher and Demi Moore during ONE Sunset Hosts Book Party For New York Times Best Selling Author and Intuitionist Laura Day - Arrivals at ONE Sunset in Los Angeles, California, United States. (Photo by Jon Kopaloff/FilmMagic)
Schauspielerin Demi Moore Und Ehemann Schauspieler Ashton Kutcher Bei Der 'Happy Tears' Premiere Im Berlinale Palast Bei Der 59. Berlinale In Berlin (Photo by Franziska Krug/Getty Images)
Ashton Kutcher And Demi Moore Arriving For The European Premiere Of Valentine'S Day At The Odeon Leicester Square, London. (Photo by Mark Cuthbert/UK Press via Getty Images)
NEW YORK, NY - SEPTEMBER 12: Ashton Kutcher, Demi Moore and Sara Paxton arrive at 'The Beautiful Life' CW Network party at Simyone Lounge in New York, New York on September 12, 2009. (Photo by Gregg DeGuire/FilmMagic)
HOLLYWOOD, CA - FEBRUARY 8: Ashton Kutcher and Demi Moore arrive at the 'Valentine's Day' Los Angeles Premiere at the Grauman's Chinese Theater on February 8, 2010 in Hollywood, California. (Photo by Gregg DeGuire/FilmMagic)
HOLLYWOOD, CA - FEBRUARY 8: Ashton Kutcher and Demi Moore arrive at the 'Valentine's Day' Los Angeles Premiere at the Grauman's Chinese Theater on February 8, 2010 in Hollywood, California. (Photo by Gregg DeGuire/FilmMagic)
NBC NEWS -- 'Live Free or Die Hard' New York Premiere -- Pictured: (l-r) Tallulah Belle Willis, actress Demi Moore and actor Ashton Kutcher arrive at the New York premiere of Die Hard 4.0, 'Live Free or Die Hard' at Radio City Music Hall on June 22, 2007 (Photo by Curtis Means/NBC/NBCU Photo Bank via Getty Images)
GERMANY - FEBRUARY 11: Actors Demi Moore and Ashton Kutcher attend the premiere of 'Happy Tears' In Berlin, Germany On February 11, 2009- They attend the premiere for 'Happy Tears' as part of the 59th Berlin Film Festival at the Berlinale Palast. (Photo by Pool LENHOF/SANCHEZ/Gamma-Rapho via Getty Images)
NEW YORK, NY - APRIL 08: Scott Eastwood visits 'The Tonight Show Starring Jimmy Fallon' at Rockefeller Center on April 8, 2015 in New York City. (Photo by Jamie McCarthy/NBC/Getty Images for 'The Tonight Show Starring Jimmy Fallon')
MIAMI, FL - MARCH 30: Britt Robertson and Scott Eastwood are seen on the set of Univision's morning show 'Despierta America' to promote the movie 'The Longest Ride' at Univision Studios on March 30, 2015 in Miami, Florida. (Photo by Alexander Tamargo/Getty Images)
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"If it makes you feel any better, he did sleep with one of my ex-girlfriends – but she was my current girlfriend at the time," Eastwood said.

"Wait, he slept with your girlfriend while you were together?" probed Watch What Happens Live host Andy Cohen. "How did you find out about that?"

RELATED: Ashton Kutcher Has No Interest 'Being the One-Night Stand Guy'

"Well, I think it was the catalyst that broke him and Demi up," Eastwood said, referencing the couple's late 2011 split.

Cohen asked if Eastwood's girlfriend at the time was one of the two girls at the center of the infamous San Diego incident that Us Weekly reported back in 2011, and the 29-year-old actor confirmed that it was. He revealed that he and one of his friends were dating the two girls at the time.

"Mmhmm, yeah, scandal," Eastwood said before taking a drink.

If you thought Eastwood was angry at Kutcher over the incident, you'd be wrong.

"No not at all," he said when asked if he still harbored resentment toward Kutcher.

Still, this is one revelation that is just too juicy not to talk about.

Tell us what you think in the comments below by tweeting @ETnow on Twitter!

Scott Eastwood stars in romantic drama The Longest Ride, which hits theaters Friday. ET takes a look at what makes Nicholas Sparks' big-screen adaptations box-office gold!

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