Check out who showed up to celebrate Perez Hilton’s 32nd birthday party, including Leona Lewis, Mel B and Katy Perry…

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Leona Lewis At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Perez Hilton and Katy Perry At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Perez and Audrina Partridge At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Mel B At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Leona Lewis At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Shannen Doherty At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Perez Hilton At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Katy Perry At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Ashley Tisdale At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Eve At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Delta Goodrem At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Lindsay Lohan At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Perez Hilton and Justin Bieber At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Alessandra Torresani At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Audrina Patridge At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Delta Goodrem At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Eve At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Melody Thornton At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Paula Abdul At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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Perez Hilton And His Mother At Perez Hilton’s 32nd Birthday Party Paramount Studios, LA

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