Kate Mara Kate Mara

Kate Mara will be joining the cast of Entourage this season, TVGuide.com has confirmed.

The young actress will play E's new assistant at his fledgling talent-management company, and perhaps his love interest as well.

Mara is best known for playing Heath Ledger's oldest daughter in Brokeback Mountain and for appearing as computer analyst Shari Rothenberg during 24's fifth season. She'll also appear in next year's Iron Man sequel.

Entourage's sixth season will air on HBO this summer.