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    Katy Perry's Early Birthday Party: John Mayer and Kristen Stewart Join the Fun

    Katy Perry, David Burtka, Neil Patrick Harris, Twitter Twitter

    Katy Perry can start celebrating early if she wants to!

    The pop singer jumpstarted her birthday festivities this weekend by throwing a massive costume party in Los Angeles at the famous Magic Castle.

    Watch Katy Perry's moving performance with an autistic fan

    Perry, who turns 28 on Thursday, dressed as a sultry vampire alongside her date for the night John Mayer who was a vampire hunter (clever), and even looked to have gone full-out with his costume by reportedly wearing a prosthetic nose and chin.

    Guests included Kristen Stewart, popular House music DJ Skrillex, songwriter Diane Warren and America's Next Top Model's Johnny Wujek, according to Us Weekly.

    David Burtka and Neil Patrick Harris—who tweeted a photo from the event—also celebrated with the "Wide Awake" songbird. "Thank you @ for having @ and me at your frightfully fun B'day Bash at the @ last night," NPH wrote.

    Earlier this week, Katy joined Mayer's family and close friends to celebrate his 35th birthday at Freemans restaurant on Manhattan's Lower East Side.

    Look at Katy Perry's fashion spotlight!

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