Halloween costumes 2011, what will the celebrities wear this year to their favorite party? Supermodel Heidi Klum will be hosting her annual Halloween party in Las Vegas this year (2011) and stars will attend all dressed up in sexy and scary costumes.

Heidi takes her Halloween costumes and Halloween parties very seriously and this will be the 12th annual bash hosted by Heidi and husband Seal for the celebrity friends to dress up for the night of partying.

Klum has hosted Halloween parties for the past decade and 2011's bash will be held at the The Venetian's Tao nightclub on 29 October (11).

The Roots star Ahmir 'Questlove' Thompson will serve as DJ.

Favorite Costume Ideas?

What will she wear - what will others wear?

So far - it's a mystery as the invite to the party features Klum dressed up as a scary cat, but she has yet to reveal what costume she'll be wearing on the night.

She recently told reporters it will be "a bit hairy".

For some hints at the lengths the celebrities go to to impress on Halloween night, see photos below of celebrities at Heidi Klum and Seal's 11th Annual Halloween Party at Lavo in New York City from last year.

Pictured below are Kim Kardashian, Coco and Ice T and Heidi and Seal.

(Images: WENN)