Britney's a Pussycat Doll

Britney Spears is jumping back onto the music scene, filming a cameo for the new Pussycat Dolls music video.

A source close to the five-piece girl group confirmed the news exclusively to Access Hollywood.

"She is doing a cameo in their new video shoot today," the source said on Wednesday.

Spears, who once joined the Pussycat Dolls on stage at a performance for her older brother Bryan's birthday, was spotted in Burbank, where the Dolls are filming the video for their new single, "When I Grow Up."

"It's a small part," a source told People about the popstar's visit to the L.A. set.