What does Britney Spears have to do with the Pussycat Dolls' new video, 'When I Grow Up'?  Well word is Brit is making a guest appearance in the new vid for the catchy song.  It was shot last Wednseday in LA and features the cats doing what they do best - gyrating and moving their bodies to phat beats and chessy yet suggestive lines.  One of the lyrics even says, 'When I grow up I wanna have boobies'!  Well hunnies I think it's safe to say you all got that wish fulfilled!  Check out pictures from the video shoot below and don't forget you can cop all the Pussycat Dolls' tracks RIGHT HERE from the Desi Hits! iTunes store!