The pop star rocks a Star of David pendant during a night out with beau Isaac Cohen in Hollywood. Plus: Paris & Nicole, Sienna Miller and more

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Besides showing off her newly brunette locks, Britney Spears models another accessory – a Star of David necklace – as she and new guy Isaac Cohen (not pictured) leave Hollywood's Chateau Marmont Monday night. A source close to Cohen tells PEOPLE that the necklace belongs to him.