Mary-Kate Olsen began her career in 1987 at the age of ... nine months, with her twin sister Ashley, in the hit television series La Fête à la Maison. With this series, which will end in 1995, the two little girls quickly become famous and lead a real empire in fashion and entertainment. Films, DVDs, books, magazines, CDs, dolls, video games, perfumes, make-up with their effigy, ...: the Olsen sisters are a real phenomenon across the Atlantic. 

Never separating, they made their big-screen debut in 1994 in the comedy Les Chenapans. They then illustrated themselves in the limelight, always playing on their "double" status, inDaddy, I Have a Mom for You (1995), then appeared briefly in the credits of Charlie's Angels - Angels Unleashed (2003). In 2004, Mary-Kate and Ashley Olsen star in the comedy A Day in New York.