It sounds like Xtina is back, declaring, “The old me’s gone and I feel brand new,” before busting out the expletives. On her new single “Not Myself Tonight” (RCA), Christina Aguilera heads back to the dancefloor with an uptempo club track that lets her get down with her “Dirrty” self, while still allowing to show that she can out-sing Britney Spears and the tribe of newcomers led by Ke$ha.

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PHOTO: Christina Aguilera at the "Hope for Haiti Now" benefit by Mark Davis for Associated Press.