Hollywood's Halloween Costumes: Heidi Klum, Miley Cyrus and Nicki Minaj Wear Shocking Ensembles (Photos)

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Heidi Klum's Halloween costume

UPDATED: See who stars like Neil Patrick Harris, Patrick Stewart, Beyonce, Adam Lambert, David Spade and Lea Michele are pretending to be.

Hollywood started getting in the Halloween spirit last weekend, with many stars donning early costumes at pre-holiday parties.

Among those dressing up were Adam Lambert as a genie, Nicole Richie as the Danny DeVito half of Twins and Fergie and Josh Duhamel, who sported two different sets of costumes. Paris Hilton and Hugh Hefner's wife Crystal also offered up variations of Miley Cyrus' VMA performance look.

The celebration continued during the week with Cyrus herself, Neil Patrick Harris, Patrick Stewart, Britney Spears, Nicki Minaj and Beyonce sharing their costumes online.

On Halloween night, Heidi Klum also continued her tradition of impressive All Hallows' Eve outfits, transforming herself into a 95-year-old woman.

Take a look at how the stars celebrated Halloween: