Things are getting pretty serious for Katy Perry and John Mayer as the two celebrated Halloween (and Katy's birthday) early, stepping out in costume together over the weekend.
The photographer who goes by the name The Cobra Snake snapped shots of the on-again, off-again couple, who were eager to pose in their elaborate ensembles. Perry, who will be 28 on Thursday, was dressed as a vampire bride (Bella Swan perhaps?), while Mayer, 35, was a zombie hunter. Both singers pulled out all the stops for their characters -- the ET singer donned donned fangs, a velvet cape and red contact lenses, and Mayer showed up with a prosthetic nose and chin.
The soiree was held at Los Angeles' Magic Castle with a star-studded guest list that included Twilight leading lady Kristen Stewart and Raising Hope star (and Perry's best friend) Shannon Woodward.