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Katy Perry Greets Hundreds of Fans After Philadelphia Concert

ABC/Fred LeeKaty Perry surprised the audience in Philadelphia on Tuesday night at the Wells Fargo Center when she announced from the stage that she'd come to the top of the Philadelphia Museum of Art steps to meet her fans.

True to her word, the 29-year old California Girl arrived attired in a pepperoni pizza onesie -- the same pattern she models in her newest video for the single, "This Is How We Do."

Katy was greeted by hundreds of fans as she made the appearance, Rocky-style, at the city landmark.

"I keep my promises Philly!" she tweeted.

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