People.com's Halloween Party

Silly, Sexy, Cool : Star Halloween Costumes!

From Mariah's naughty firefighter to Kim's Wonder Woman, see how celebs reveal their alter egos

AVRIL LAVIGNE

She once sang about a "Sk8er Boi" – but Avril Lavigne makes one punky racer girl! The singer combines sporty with flirty while partying at Hyde in West Hollywood in 2007.



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