Signed by an agent at age 17 , she made her acting debut at 18 on television and her feature film debut the following year in `` Venus Beauty Institute '' ( 1999 ) , for which she received critical acclaim and won the César Award for Most Promising Actress .
She made her acting debut at 18 on television and the following year in the feature film in `` Venus Beauty Institute '' ( 1999 ) when she won the `` César Award for Most Promising Actress '' .