Her former Mickey Mouse Club buddy, Britney Spears, used to be very, very hot. As she's transformed herself into a perpetually pregant airhead with REALLY awful taste in men, however, Brit's looks have gone down the toilet faster than post-meal food from the stomach of Lindsay Lohan.

Christina Aguilera has had the opposite fate, fortunately for men across the world. As shown here in our second instance of Classic Celebrity Pictures, X-tina has changed with the times - but managed to maintain that beautiful, sexy, my-goodness-we-need-new-pants look: