View the Gallery / 26 Photos »

Gossip Girl star, Leighton Meester, took to the stage at Butter in NYC to help singer Robin Thicke celebrate the release of his album, Sex Therapy.

Leighton joined Robin to perform their single, “Somebody to Love,” backed by a 10-piece band. For the occasion, Robin was all kinds of smooth sophistication in a black velvet tuxedo and Leighton was flirty in a short black dress and cheetah-print ankle boots.

Also taking to the stage was rapper, Nicki Minaj, who looked fierce in a slinky, black lace dress. And a source tells the Page Six that celebs attending the event had a ball. The snitch reveals, “Beyonce was really enjoying the performance. She sang along to Robin’s songs and smiled and clapped as Leighton performed while drinking Svedka martinis.”

Who needs somebody to love when you’ve got martinis?

Gallery Info: Robin Thicke, Leighton Meester, Nicki Minaj, John Legend, Scott Sartiano and Andre Balazs at the album release party for Sex Therapy.