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| Robert Pattinson and Kristen Stewart partied with Katy Perry |
In a blurry six second video posted on YouTube, Kristen - who is good friends with the birthday girl, Tamra Natisin - can be seen standing next to Robert and appears to be taking a phone snapshot of him, while Katy brings out a cake and initiates a chorus of 'Happy Birthday'.
The 'Part Of Me' singer seemed in a good mood considering she has just split with boyfriend John Mayer after a seven month romance.
Kristen and Robert - who briefly split last summer after she was caught cheating with married film director Rupert Sanders - have been making the most of their time together by hitting the town for nights out.
News of the pair's reunion was made public on Tuesday at a karaoke bar in Los Angeles, and a lucky fan managed to get a photo with the pair.
Fan Laura Austin tweeted: "I just ran into them at a karaoke bar by my house... mellow night. They were just there hanging out with a few friends."
