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KIIS FM’s Wango Tango 2010 came off at the Staples Center on May 15, 2010 in LA.

A few celebrities showed up to support the performing lineup, which included Adam Lambert, Justin Bieber, Ke$ha, Kelly Rowland and Usher.

Read more to see who wore what, including the Kardashians’ little sisters, Ke$ha and stars of “The Hills” and “The City.”

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Ashley Greene

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Ke$ha

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Kelly Rowland

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Kendall Jenner

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Kristin Cavallari

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Kylie Jenner

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Roxy Olin