(Scandal! Scott Eastwood has revealed that his ex-girlfriend cheated on him with Ashton Kutcher in 2011, while the actor was still married to Demi Moore)

After listening to Jon recount their initial on-set meeting, Scott chimed in: ‘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.

Smiling as fellow guest Jon and Watch What Happens Live host Andy Cohen reacted in shock, Scott, son of Clint Eastwood, added: ‘I think it was the catalyst that broke him and Demi up.’

When asked by host Andy if it was ‘the girl in San Diego’, Scott responded: ‘It was… her and her friend. Remember those pictures? My buddy and I dated those two girls… Scandal!’

Ashton is alleged to have had a tryst with blonde Sara at the Hard Rock Hotel in San Diego on September 24, 2011 – which was the six-year anniversary of his marriage to Demi.

While it appeared that they were working through the subsequent fallout from the claims, the couple separated, with Demi, 52, filing for divorce in December of that year.

Ashton, who is now married to his former That ’70s Show co-star Mila Kunis – with whom he has six-month-old daughter Wyatt Isabelle – has never publicly admitted to an affair.

But Sara has spoken about their enounter, expressing regret months later after falling out with friends and relatives and losing her job.

She told FOX411.com: ‘I don’t watch television and I read very few magazines. It never crossed my mind that he was married. But then he said he was separated, which still doesn’t make things okay, but I wasn’t thinking clearly.’

‘He was a good looking guy and it was stupid. When people say to me “I can’t believe you did that” I want to say back that most 22-year-old girls in my position would have done the same thing.’

In a 2013 interview with The Sun, she stated: ‘I’ve been cheated on so I know how terrible that feels. I can’t even imagine what it feels like to be cheated on by a husband and have it blow up in your face.

‘My intention wasn’t to go out and ruin a marriage. I think Demi handled it in the best way she possibly could.’