Following another split from John Mayer, Simpson parties the night away in West Hollywood. Plus: Kate Hudson, Nicole Richie and more

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CUTTING LOOSE

While off-again boyfriend John Mayer worked out his emotions through song, Jessica Simpson heads to West Hollywood haunt Celadon on Tuesday, where she partied all night, sipping VeeV cocktails in the VIP room with her pals. "She was super happy and upbeat," says a fellow partygoer.