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.
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.
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.