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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SIDEWAYS

Sienna Miller flows down the red carpet in Dior by John Galliano gown at Sunday's BAFTA Awards in London. Once inside, the actress and her boyfriend, actor Rhys Ifans, held hands and nuzzled each other as they walked through the crowded ballroom to their table.