4 Minutes by Madonna featuring Justin Timberlake. Her newest single.
Somebody please help me and bribe Madonna to retire already. Not likely because apparently this allowed her to break Elvis's record of top 10 singles, and her new CD isn't even out yet... but still!
(Okay, I admit it, it's kinda catchy. I like JT's singing better though. And I hate Madonna's annoying "tick-tock, tick-tock.")