Lady Gaga, Gwen Stefani And More Do Halloween (PHOTOS)

Last night, many of us celebrated Halloween by dressing as our favorite pop star, but what do music's biggest artists masquerade as on October 31st? Gwen Stefani dressed as the infamous Cat Woman, while Glee's Matthew Morrison donned an afro for his Richard Simmons costume. Burlesque star, Christina Aguilera went as a sexy officer of the law.  And, just to be sure she'd still top PETA's Most Hated list, Lady Gaga went as the dalmatian fur-wearing Cruella Deville. Check out all the ghoulish g...

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