Aguilera and husband Jordan Bratman celebrate the opening of a new art museum in L.A. Plus: Sienna Miller, Nicole Richie and more

16 of 24

SIDEWALKS OF NEW YORK

In New York for the Gucci party, Salma Hayek and fiancé Francois-Henri Pinault – who's CEO of PPR, the $23 billion conglomerate that includes the Gucci Group – enjoy a stroll near their Midtown Manhattan hotel Friday.