![Katy Perry: Vampire Birthday Bash with John Mayer!: Photo 2741718 | David Hudson, Ferras, John Mayer, Johnny Wujek, Katy Perry, Markus Molinari, Mia Moretti, Shannon Woodward Pictures | Just Jared Katy Perry: Vampire Birthday Bash with John Mayer!: Photo 2741718 | David Hudson, Ferras, John Mayer, Johnny Wujek, Katy Perry, Markus Molinari, Mia Moretti, Shannon Woodward Pictures | Just Jared](https://cdn.justjared.com/wp-content/uploads/2012/10/perry-vampire/katy-perry-vampire-birthday-bash-with-john-mayer-18.jpg)
Katy Perry: Vampire Birthday Bash with John Mayer!: Photo 2741718 | David Hudson, Ferras, John Mayer, Johnny Wujek, Katy Perry, Markus Molinari, Mia Moretti, Shannon Woodward Pictures | Just Jared
![J. on Twitter: "#Spotted @katyperry in a vampire costume at her birthday party with John Mayer, Friday night in L.A #SoonHalloween http://t.co/IItnkugD" / Twitter J. on Twitter: "#Spotted @katyperry in a vampire costume at her birthday party with John Mayer, Friday night in L.A #SoonHalloween http://t.co/IItnkugD" / Twitter](https://pbs.twimg.com/media/A5uCRYICAAA44Fu.png)
J. on Twitter: "#Spotted @katyperry in a vampire costume at her birthday party with John Mayer, Friday night in L.A #SoonHalloween http://t.co/IItnkugD" / Twitter
![Wild Katy Perry appeared on Twitter: "Katy Perry vampire is so hot and perfect https://t.co/DOjUQ01ZjY" / Twitter Wild Katy Perry appeared on Twitter: "Katy Perry vampire is so hot and perfect https://t.co/DOjUQ01ZjY" / Twitter](https://pbs.twimg.com/media/E9BbTELXsAcShKd.jpg)