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Rihanna - Read on for our recap of the most frightfully fun Halloween looks of 2012 and tell us: which is your favorite in the comments section below. Rihanna hosted a private Halloween party at Greystone Manor in West Hollywood and arrived in a green "Mary Jane" wedding dress. Click through for more of last year's best celebrity costumes. (Photo: Instagram via Rihanna)

Photo By Photo: Instagram via Rihanna

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Mariah Carey and Family - Mariah and Nick make it a family affair as Goldilocks and the three little bears.  (Photo: Courtesy of Mariah Carey)

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Dwayne "The Rock" Johnson - The Rock nails it as The Hulk! "Don't make me angry. You wouldn't like me when I'm angry," he tweeted. (Photo: Courtesy of Dwayne Johnson)

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Keyshia Cole and Daniel Gibson - The singer dresses up like a big baby, with diaper and all, and her husband poses by her side as Jerome from Martin. (Photo: Instagram via Keyshia Cole)

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Drake - Drake as Borat is hilarious. The mustache, flag and wig are spot-on.  (Photo: Instagram via Drake)

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Jennifer Lopez and Casper Smart - J.Lo tweets, "Here's my costume! #HappyHalloween!" (Photo: Courtesy of Jennifer Lopez)

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Kevin Hart and Emiko - Actor and comedian Kevin Hart wears an extremely tight-fitting denim jumper while arriving in '70s style with girlfriend Emiko to a Halloween party in Hollywood. Photo: PacificCoastNews.com)

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Kourtney and Kim Kardashian - Kardashian sisters Kourt and Kim play twinsies as Batwoman and Catwoman for Kim's Halloween Birthday Bash in Miami. (Photo: Alexander Tamargo/Getty Images)

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Kanye West and Kim Kardashian - The couple hit a Halloween party in Miami in Batman costumes, with Kim dressing up as Catwoman and Kanye going as the Dark Knight himself. (Photo: John Parra/WireImage)

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Chris Brown and Friends - The singer posts a Twitpic of himself and his crew wearing long beards and turbans and carrying guns, seemingly in an effort to look like “terrorists.” “Ain’t nobody F--king wit my clique!!!! #ohb” wrote Brown. (Photo: Instagram via Chris Brown)

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Miley Cyrus - We love Miley's interpretation of Nicki Minaj, from the yellow wig to her padded assets and leopard bodysuit. (Photo: Miley Cirus/ Twitter)

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Christina Milian - Christina Milian leaves the William Morris Halloween party in Hollywood in her Queen of Hearts costume. (Photo: PacificCoastNews.com)

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Cassie and Diddy - The pair dress as an Egyptian stunner and Prince for Halloween.  (Photo: instagram)

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Jessica Simpson - Simpson flaunts her post-baby bod in a sexy costume. We're guessing...milkmaid? (Photo: Jessica Simpson/Twitter)

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Diddy - Diddy goes as singer Prince, complete with a white guitar, purple cloak and a huge wig. (Photo: PacificCoastNews.com)

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Kanye West and Kim Kardashian - Kim Kardashian is a mermaid and her boyfriend Kanye West serves as captain for the Midori Halloween party in New York. (Photo: TS,PacificCoastNews.com)

Photo By Photo: ?TS

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Draya Michele - Draya Michele left little to the imagination by dressing up as a bride on her wedding night.  (Photo: Twitter)

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La La Anthony - La La Anthony is looking prrrretty sexy at the Midori Halloween party in New York City this weekend.  (Photo: Andres Otero/WENN.com)

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Fergie - Fergie also goes the kitty cat route for Halloween this year. (Photo: Twitter)

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Jessica White - Apparently it was just another day for Jessica White as the Victoria's Secret model decided to dress up in lingerie at her Halloween lingerie party in New York City.  (Photo: Demis Maryannakis, PacificCoastNews.com )

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Holly Robinson Peete - How frightfully lovely is Holly Robinson Peete as Prince? (Photo: Holly Robinson Peete/ Twitter)

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Christina Milian and Violet - Christina Milian and her daughter Violet look adorable in their monster costumes. (Photo: Twitter)

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Big Boi and Sherlita - Big Boi and wife Sherlita are perfect as Star Wars' Darth Vader and a sexy Punisher.   (Photo: Twitter)

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Heidi Klum - Heidi Klum always goes all out for Halloween and last year was no different for her 13th annual Halloween party. (Photo: Michael Loccisano/Getty Images for Heidi Klum)

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Jessica Alba and Cash Warren  - Jessica Alba's costume is a family affair as she pulls in her husband and daughter to become The Incredibles. (Photo: Twitter)