Stars' Halloween-Worthy Looks

The California Gurl ditched her retro pinup look for futuristic – and sometimes comical – getups this year. From her space-age "Alien" costume to the nerd-girl chic of "Last Friday Night" to her geometric MTV Video Music Awards outfit, Perry always keeps us guessing.

The "Super Bass" singer knows how to amp up the drama! She tops her bright geometric-print jumpsuit with a sky-high angular pink wig (pretty much the only time she's matched), dons a colorful plastic outfit and animal-print boots for a GMA performance, and hit the VMAs Harajuku-style, complete with a face mask and stuffed tail.

Gaga, ooh-la-la! Little Monsters have their pick of Lady Gaga getups this Halloween. The singer steps out in her signature sky-high red platforms, is spot-on as a polka dot – and famously dresses in drag as "Joe Calderone" for her "You + I" video – even staying in character as her male alter ego at the MTV VMAs.

The glitter-loving singer adheres to a trashy-chic look (she even once wore a garbage bag), first pairing mud-crusted boots with a fluffy coat, then taking the stage in a shredded American-flag shirt and tights, and finally stepping out in London in a sparkling skeleton bodysuit.

The "F– You" singer is anything but forgettable – just check out his outrageous stage outfits! From his gold robe to his feathered outfit – complete with gladiator-style breastplate – to his sparkly jacket and headpiece, Green's ensembles leave us spellbound!

The pouf is so last season. Anyone wanting to emulate the Jersey Shore troublemaker needs to update their look – and Polizzi provides plenty of inspiration. Would-be Snookis can copy her metallic leopard-print skirt (complete with "Brunette Mafia" top), her jean short-shorts (with her ever-present fluffy boots and shades), or her go-to party look, a hair bow and super-short cocktail dress.