The new style is a drastic transformation from the singer's usual blonde ... "Liking the new dark hair!" someone wrote under an Instagram clip of Pink's performance, during which she sang her ...

To complement the pink hair, Aguilera wore a baby pink ... The "Beautiful" singer has been testing out new hair colors in recent weeks: For her concert in São Paulo, Brazil earlier this month ...

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 ...