Britney Spears Looks 'Hot And Blonde' In Pussycat Dolls' 'When I Grow Up' Video: Report

'When [Britney] saw them on the MTV [Movie Awards], she was totally down to do the video,' source says.

First, "How I Met Your Mother" — now, the Pussycat Dolls.

Her albums might not sell the way they used to, but Britney Spears is turning into the queen of the red-hot cameo. According to People magazine, Brit filmed a bit part in the video for the Pussycat Dolls' "When I Grow Up" clip.

An unnamed source told the magazine that Spears had a "small part" in the video, which was shot Wednesday in Los Angeles. A "set source" told that Spears does not interact with the group in the video, and shot her scenes at the Warner Bros. lot Wednesday while the Dolls filmed in Hollywood. "In the scene shot [Wednesday], Britney is driving in a car," the source said. "They all wave at each other as they are passing in traffic — that is it. Of course, Britney looks hot and blonde. It is a very short sequence, but [Britney] had a lot of fun with it. Britney really likes the Dolls' music and when she saw them on the MTV [Movie Awards], she was totally down to do the video."

Spokespeople for Spears and the Dolls could not be reached for comment at press time.

Coming on the heels of her two-episode arc on "How I Met Your Mother," the Dolls shoot represents Spears' latest attempt to ease back into the spotlight, after spending much of the past year dealing with a series of personal crises. In fact, her second appearance on the sitcom went so well that onetime Brit doubter Neil Patrick Harris recently told People that "the door is open for her" to come back for a third go-round.

After a sizzling performance of "When I Grow Up" at the MTV Movie Awards last weekend, we'll be seeing plenty of PCD in the upcoming weeks. They'll appear on the June 12 episode of "So You Think You Can Dance," and the video for "When I Grow Up" will premiere on the new MTV video show "F'N MTV," which is hosted by Fall Out Boy bassist Pete Wentz, on the 13th.

According to a source at their label, PCD's yet-untitled second album, featuring production from Timbaland, Rodney Jerkins and Sean Garrett, will be out in September.

[This story was originally published on 6.5.08 at 3:41 p.m. ET]