As if we needed any more evidence that Christina Aguilera is thee experimental hair muse of our generation (read: she is the trailblazer behind two-tone hair), the singer has only gone and debuted ...

Christina Aguilera, Kelly Clarkson and Nicole Richie have in common? They're all celebrities, it's true, but beyond that, each of these stars succumbed to the call of "calico hair" in the 2000s.

Christina Aguilera is booked and busy ... and headed for an outfit change. Aguilera’s blonde hair was on display, and she may be responsible for bringing back crimped hair if we see it this ...

To complement the pink hair, Aguilera wore a baby pink lipstick to match, and made her lips pop even more with the addition of brown lip liner. The glam continued with fringed eyelashes ...

As if we needed any more evidence that Christina Aguilera is thee experimental hair muse of our generation (read: she is the trailblazer behind two-tone hair), the singer has only gone and debuted ...