We’re used to seeing her hanging with Blake Lively, Penn Badgley, and the rest of the Gossip Girl gang. But last night (September 3), Leighton Meester had a whole new Entourage.

The beautiful brunette babe was spotted at the Ziegfeld Theatre in New York City for the big “HBO Presents the Premiere of the Fifth Season of Entourage.”

And Miss Meester was looking quite sexy as she posed for the paparazzi on the red carpet, sporting a flirty sleeveless black dress teamed with a pair of fancy peep-toe heels.

Leighton was more than just a celebrity spectator, she’s also a guest star on the new season of which star Adrian Grenier told press, "I think it's going to be a new experience for the audience. You're going to see things you haven't seen before."

Jeremy Piven agreed, stating, "To me it's the best season yet. It's about real things and it's truthful and I think season five is the best one."

Gossip Girls

Enjoy the pictures of Leighton Meester at the "Entourage" party last night (September 3).