How Lady Gaga & Beyonc� Celebrated After the Grammys

? She had a big night at Sunday's Grammy Awards - and Lady Gaga was ready to party at Jimmy Iovine's bash at L'Ermitage in Beverly Hills. The pop star, in all black, was the first guest to perform, playing the piano for the star-studded crowd, which included Kim Kardashian. Also there: Beyonc�, who arrived with hubby Jay-Z. According to a fellow party guest, she "seemed really happy, and he was lovingly rubbing her back."

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