Cobra Starship frontman Gabe Saporta will guest star the Gossip Girl season finale May 14.

The 32-year-old will make his acting debut in the episode, "The Return of The Ring" (for much more on the big episode, follow the link for our Gossip Girl season finale spoilers article and discussion).

"Acting is something that has been of interest to him for a while," a source says of Saporta, 32, whose casting was first reported by E! Online. "So when he was offered the role, he jumped at it."

"I can tell you that he's playing a character that is not a musician," the informer said.

This isn't Saporta's first Gossip Girl collaboration. Cobra Starship's hit song "Good Girls Go Bad" features vocals by Leighton Meester, who also appears in the video. The song has been featured on Gossip Girl as well.

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