Does anyone know the song used on the showtime summer promo?

I really like that song being used for the showtime network on austar at the moment, maybe the summer on showtime promo? The only lyrics I can remember are "Just shake it like-" something. The ad features (from memory) snippets of movies, like Mr Bean dancing and Borat.....does anyone know the song and artist? Sorry I don't have more info to give, but it's driving me crazy! Thanks :-)