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

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THE MAMA & THE PAPA

Taking a break from diaper duty, Nicole Richie and Joel Madden stick close together at EW's Grammys afterparty at STK in West Hollywood after Sunday's telecast. The pair sipped champagne and talked with well-wisher before heading out for the night.

Check out full coverage of Grammy night.

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