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22 October 2012, 16:59
The 'Teenage Dream' singer and boyfriend John Mayer hosted a celebrity party for her upcoming birthday.
Katy Perry held a pre-birthday celebration over the weekend ahead of turning 28 this week, and dressed up as a vampire at the fancy dress themed bash.
The 'Part Of Me' star reportedly wore vampire fans, a velvet cape and red contact lenses in her eyes for the party, held at the Magic Castle in Los Angeles on Friday evening (19th October).
Katy's oft-rumoured boyfriend John Mayer also got into the fancy dress spirit by becoming a zombie hunter for the occasion, with a prosthetic nose and chin completing his Halloween themed outfit for the bash.
The 'Teenage Dream' stars' birthday party was attended by a who's who of Hollywood celebrities including Twilight actress Kristen Stewart, Kyle XY star Matt Dallas and Katy's good friend Shannon Woodward, best known for her role in Raising Hope.
Check out a picture of Katy Perry out and about in Los Angeles earlier this month below:
Last week saw Katy also celebrating 'Your Body Is A Wonderland' singer John Mayer's birthday for a lunch date out and a romantic evening meal in New York City.
Katy Perry has spent the past several weeks performing at a number of charity events across the US, including a duet performance with young autistic pianist Jodi DiPiazza for the Night Of Too Many Stars charity event.