Star Spotting: Katy Perry Can't Stop, Won't Stop

After a long week that involved performing at the MuchMusic Awards in Canada, getting 17 stitches after a dance disaster, changing hair styles more frequently than most people change undies, and being seriously -- and understandably jet lagged -- you'd think Katy Perry would just wanna crawl into bed and take the nap to end all naps. But you'd be wrong. Last night, on her way out of a recording studio in London, Katy Perry stopped to chat with a crowd of onlookers, take photos and thank the fans who helped make "California Gurls" one of the hottest songs of the summer, not to mention the top song on the Billboard Hot 100. Katy Perry, do you EVER sleep?

+ Watch "California Gurls" (again!), and check out the 10 things we love most about the video.