The High School Musical stars are all smiles while out to dinner in L.A. Plus: Brad Pitt, Mariah Carey, Miley Cyrus and more

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A TIGHT LEASH

Mischa Barton shows a dogged commitment to her pets, taking pooches Ziggy and Charlie for a little fresh air on Saturday in Beverly Hills. Days earlier, the actress was arrested for a DUI – and she subsequently bowed out of an appearance at the opening of Las Vegas nightspot the CatHouse.