Neil Patrick Harris, Matthew Morrison, Scott Disick

Bryan Steffy/WireImage; AKM-GSI

Halloween is upon us, and—in true Hollywood fashion—celebs are unleashing all sorts of sartorial tricks and treats as they show off their snazzy costumes.

From Miley Cyrus channeling Nicki Minaj to Jessica Simpson rocking a sexy medieval frock to Neil Patrick Harris showing off his dark side, the stars definitely shined in a whole new way.

Meanwhile,Scott Disick hosted an American Psycho–themed party in Sin City, Matthew Morrison conjured up old-school Justin Timberlake, Emma Roberts gave us her aunt Julia Roberts' Pretty Woman outfit, Ryan Seacrest and Julianne Hough stepped out as Bonnie and Clyde, and Kim Kardashian made for a marvelous mermaid with Kanye West as her captain.

And when all else fails, there's always a sexy unicorn getup, courtesy of teen bride Courtney Stodden. Giddyup!

(Originally published on Oct. 29, 2012, at 8:15 a.m. PT)

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