Katy Perry rocked a couple sexy dresses this week while making a few promo appearances in NYC.

Katy Perry
First, she was spotted in a yellow, Dolce&Gabbana mini dress Monday night in New York (left) -- and then a vinyl, turquoise and pink, palm tree number at a Volkswagen event yesterday (right).
(Check out Katy's new "California Gurls" video!)

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