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'Dirrty' Girl

With a ''Dirrty'' R-rated video and a hot new album, Christina Aguilera is back in the spotlight. Take our tour of the 21-year-old singer's nicest -- and nastiest -- moments

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Nasty or nice? See Christina Aguilera's most memorable moments | 151258__christina1_l

'Dirrty' Girl

CURL CRAZY Apparently taking a (curly) cue from Twisted Sister singer Dee Snyder, Aguilera gives big hair and pink warpaint a twirl for the 2001 MTV Movie Awards in Los Angeles

CURL CRAZY Apparently taking a (curly) cue from Twisted Sister singer Dee Snyder, Aguilera gives big hair and pink warpaint a twirl for the 2001 MTV Movie Awards in Los Angeles Next Item in this Gallery

Christina Aguilera: Frank Micelotta/ImageDirect