Isla Fisher is reportedly pregnant with fiancé Sacha Baron Cohen's baby.The 'Wedding Crashers' actress reportedly announced the couple's happy news in Los Angeles' the Cat and Fiddle pub. A source is quoted by Britain's Daily Star newspaper as saying: "Isla called everyone to a toast and gushed, 'We have got good news. I am pregnant.' "The Australian star sparked rumors she is expecting the Borat star's child when she wore a jacket and loose-fitting dress to the premiere of her new movie 'The Lookout', in what appeared to be an attempt to hide her baby bump. However, Isla's representative has refused to confirm the pregnancy, saying:"If or when Isla becomes pregnant, she and her fiancé will decide if an announcement is necessary."In 'The Lookout', the 31-year-old Australian star plays a stripper who seduces a brain-damaged man. Isla revealed her role as an obsessive girlfriend in 'Wedding Crashers' has left men terrified of her. She told USA Today newspaper: "Men didn't hit on me afterwards, they were terrified. I was once in a grocery store, and I laughed and this guy literally jumped in the air. He said, 'I'm really sorry, but you have the same laugh as the girl from 'Wedding Crashers' and you really scared me.' "