Katy Perry Sings For Windows Phones In New York

Singer appeared at Roseland Ballroom in New York on Monday night.

Sunday night in Madrid at the 2010 MTV Europe Music Awards, Katy Perry won the Best Video statue for "California Gurls." Less than 24 hours later, jetlag be damned, she was onstage at the Roseland Ballroom in New York, running through a high-energy version of that award-winning tune.

Pop stars, it seems, don't need rest. At least not when there's a ballroom filled with head-bopping, drink-spilling revelers there to see you play, well, "California Gurls." Perry waited until fairly late in her set to bust into that #1 Hot 100 hit. By then she'd burned through old faves as well as fresh cuts off Teenage Dream.

The occasion for all this revelry was the launch of the new Windows Phone, and if concertgoers weren't aware of that promotional fact from the oversize screens blaring the message, Perry made sure everyone knew what was up. She hyped the software company, playfully admonished them for not providing the crowd with free booze, and suggested everyone should use a Windows-enabled device to surf the Web.

Subtle, the event was not. But that didn't stop it from being a whole lot of fun. Perry kicked off the evening by jumping out of a pink cake, then busted into "Hot N Cold." From there she presented a rejiggered version of "I Kissed a Girl," working up from a loungey vibe to an almost heavy metal roar and finally into its familiar, radio-friendly sound. The singer followed up with tunes like "Ur So Gay," "Teenage Dream" and "Peacock."

Barely an hour after she'd begun, the show was over. Perry, hopefully, was off to get some shut-eye. The crowd was left to bat around a few enormous beach balls the singer had unleashed during the finale with the simple encouragement, or dire warning, "That's some big-ass balls!"