Katy Perry Boyfriend List Gallery: John Mayer, Travie McCoy, Josh Groban, Russell Brand, Robert Pattinson, And More!

Through Russell Brand and John Mayer, Katy Perry has an extensive and surprising boyfriend list. From her first sweetheart to heartthrob models, who do you think is on Katy Perry's boyfriend list? Check out the Katy Perry boyfriend list gallery above to find out!