Mary-Kate Olsen's Ashley arguing

Mary-Kate Olsen admits she and twin sister Ashley often argue. Mary-Kate Olsen and Ashley Olsen - U.S. Premiere - Arrivals - Mann Village Theatre - Westwood, CA, USA © Lee Roth / RothStock / PR Photos

Mary-Kate Olsen and Ashley Olsen - U.S. Premiere - Arrivals - Mann Village Theatre - Westwood, CA, USA © Lee Roth / RothStock / PR PhotosThe actress - who shot to fame with her sibling aged nine-months-old when they both played the role of Michelle Tanner on hit US TV show 'Full House' - says they don't always agree, but thinks their differing views help their creativity.Mary-Kate - who has her own clothing line with Ashley - revealed: "We don't agree all the time. The way we go about business or designing or making a decision is that we come at it from two completely different angles that at the end of the day, even when we don't think we're agreeing with each other, we are agreeing. We're just getting there in different ways. Unless you're a twin, you honestly can't know how close twins can be."Mary-Kate also finds it difficult to understand fame and finds it "weird" when her picture is taken.She added: "It's weird to be called a celebrity or talk about it. I don't talk about being a celebrity in my business meetings. I don't talk about it with my friends. It's not a part of my life. It's a media perception of who I am. It's very weird. "I mean, if I see a paparazzi shot of me walking that's in a magazine or something at some event, it's as if I see it from an outsider's point of view. There's like a character, almost, and then there's me."(C) BANG Media International