Hollywood hunk Ashton Kutcher has taken to Twitter (where else?) to slam the rumours that he’s cheated on wife Demi Moore. US gossip magazine Star had claimed that the actor was seen smooching with a woman who wasn’t Demi by a bathroom in an Italian restaurant in LA, but Ashton has used the mrico-blogging site to deny these claims.Ashton has hit back saying, "I think Star magazine calling me a "cheater" qualifies as defamation of character. I hope my lawyer agrees," he then followed that up by saying, "STAR magazine - you don't get to stand behind "freedom of the press" when you are writing fiction." Ooh! Sounds like someone's pretty darn cross, doesn't it?