Ashton, Demi Have 'Open Relationship' Alleged mistress justifies Ashton's cheating By Evann Gastaldo, Newser Staff Posted Oct 7, 2010 8:21 AM CDT 20 comments Comments Actors Ashton Kutcher and Demi Moore announce the launch of a campaign to help end child sex slavery during the Clinton Global Initiative on Sept. 23, 2010 in New York. (AP Photo/Evan Agostini) (Newser) – Well, this could explain Ashton Kutcher’s (alleged) cheating: His supposed mistress claims he and Demi Moore have an open relationship. Kutcher also told Brittney Jones he and Moore “have threesomes often,” she tells Star magazine in an interview obtained by Radar. Because of that, “I didn’t feel at all like he had just cheated on his wife,” she says. Click here for more, including the real reason Moore was upset at Kutcher (hint: It has something to do with the aforementioned threesomes).