Aussie actress Isla Fisher has confirmed she's pregnant, but jokes the child she's carrying might not be fiance Sacha Baron Cohen's. The Wedding Crashers star admits she went out of her way to hide her pregnancy at first - because it wasn't anyone's business. She tells, "In the beginning I dodged the rumours... I was trying not to be rude, but there's a time before you're sure everything is all right with no complications that you just don't want to discuss it." And she jokes she also had to find out who the father was: "I'm doing DNA tests with the cast of (new film) Hot Rod and the cast of Wedding Crashers, and hopefully I'll find out for sure."