Celebrity Halloween costumes: Who wore it best?

Jessica Alba looks so good with blond hair and black roots it's, like, not even funny. The Sin City actress teamed up with her friend Kelly Sawyer to pull off a Romy and Michelle-inspired Halloween costume, showing other celebs how to do the holiday right.

"[We] invented post-its," Alba wrote on Instagram, the two emulating the classic characters from Lisa Kudrow and Mia Sorvino. Alba is obviously channeling Romy in the blue dress, while her own BFF is pretty in pink as Michelle. Check out their photo below.

Alba joins the likes of Tyra Banks, Colton Haynes, and Ellen DeGeneres as a celeb crushing it on the Halloween costume front. That pool seems to be growing by the minute as more of your favorite stars get ready for a night of festivities.

Check out Hugh Jackman, Justin Bieber, Nicki Minaj, Halloween top dogs Team Neil Patrick Harris, and more celeb costumes.

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Who do you think won Halloween? Vote below. <iframe height="822" width="100%" scrolling="no" frameborder="0" src="//renderer.qmerce.com/interaction/56352f3060dcf0427c438844" class="" allowfullscreen="" resize="0" replace_attributes="1" name=""></iframe>