The Grey's Anatomy star has a good laugh during an outing in L.A. Plus: Lindsay Lohan, the Cheetah Girls and more

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ROYAL GOOD TIME

Prince William and on-again girlfriend Kate Middleton step out to celebrate a pal's birthday bash at London eatery Cocoon on Saturday night. Next, the party moved to the club Volstead, where the couple partied until almost 3 a.m.