Christina Aguilera showed she was back to form at the VMAs last night.  The new mom showed off her slender figure and new haircut on the red carpet and then rocked the stage with an old school/new school performance.

Check out Xtina performing her revamped version of "Genie in a Bottle" (in honor of her new greatest hits album) as well as her new single "Keeps Gettin' Better."