Aguilera strikes a pose while shopping in West Hollywood. Plus: Brad & Angie, Ashley Olsen, Leighton Meester and more

TAKE A STANCE

Before handling hosting duties at club LAX's New Year's Eve bash, Fergie and her Black Eyed Peas bandmates (not pictured) take the stage Tuesday night for a concert at Mandalay Bay in Las Vegas.

See where other stars are ringing in the new year!