Janet Jackson

It's a little bit sad to think that for an entire generation, Janet Jackson is better known for baring her breast on live television than for her relentless stream of late '80s hits. The Unbreakable World Tour marks her first outing in four years, in conjunction with her new album, Unbreakable. The 49-year-old pop star probably can't pull off the "Nasty" choreography anymore, but that's what backup dancers are for.