Christina Aguilera

It's not standard policy to suggest traveling elsewhere for a show, but in the case of Christina Aguilera, it would be a disservice not to. Sure, her date here will be worthwhile — ever since "Genie in a Bottle" dominated radio, there's been no doubt that she can sing. And via the at-odds statements of independence "Dirrty" and "Beautiful," Xtina transformed herself into an intriguing personality, culminating in last year's new-jack-big-band album, Back to Basics. Yet recently, the Maxim cover girl revealed that she practices a little something called "Naked Sundays," so clearly that's the day to check her out. Sadly, her next Sunday concert isn't until March 25 in Toronto, and there's a slim chance that her "Naked Sundays" policy extends to the stage. But you never know.