At the age of six, Leslie made her Broadway debut in the play The Patriots.In the 1986 American comedy Head of the Class, featuring Hollywood icon Brad Pitt, Leslie played the role of Maria Borges. She was a part of 68 episodes of the show. After that, she was cast in the crime drama C-16: FBI.
Bega portrayed Leah in three episodes of the wildly popular CSI: Criminal Scene Investigation crime drama television series. She portrayed Valentina La Paz, Tony Soprano’s mistress, in the critically acclaimed crime drama television series The Sopranos. She has made cameo appearances in several TV shows, such as CSI: NY, Nip/Tuck, and American Dad!Her other notable roles include Mobsters, a crime drama from 1991; The American President, a comedy drama from 1995; and Lost Highway, a suspense thriller from 1997. At the Lincoln Center, Leslie had a solo performance in 2001.
