Those sexy singing sirens are back with a new album and hit single. The Pussycat Dolls are following up 2005′s PCD, which sold over 7 million copies, with a new yet-to-be-titled summer release. They debut their first single "When I Grow Up" at the 2008 MTV Movie Awards, last week. Check it out here! Also stay tuned to AMG for updates regarding the girls’ new album, tour dates and give-a-ways.