Celebs Dress Up For A Halloween House Party In Beverly Hills

Oct. 27 2012, Published 4:12 a.m. ET
Celebs Dress Up For A Halloween House Party In Beverly Hills
1. Paris Hilton and boyfriend River Viperi get dressed up for a Halloween house party in Beverly Hills.

Paris Hilton and boyfriend River Viperi get dressed up for a Halloween house party in Beverly Hills.
2. Hilary Duff arrives at a Halloween house party in Beverly Hills dressed in a Dia de los Muertos costume.

Hilary Duff arrives at a Halloween house party in Beverly Hills dressed in a Dia de los Muertos costume.
3. Hilary Duff and husband Mike Comrie are a spooky pair, arriving in costume for the party.

Hilary Duff and husband Mike Comrie are a spooky pair, arriving in costume for the party.
4. Julianne Hough and Ryan Seacrest go to the party as Bonnie and Clyde.

Julianne Hough and Ryan Seacrest go to the party as Bonnie and Clyde.
5. Seal arrives at the party with a date.

Seal arrives at the party with a date.
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6. Emma Roberts dresses as her aunt Julia Roberts in 'Pretty Woman' for Halloween.

Emma Roberts dresses as her aunt Julia Roberts in 'Pretty Woman' for Halloween.
7. Derek Hough is a Jedi!

Derek Hough is a Jedi!
8. Alessandra Ambrosio is a sexy general, arriving with husband Jamie Mazur.

Alessandra Ambrosio is a sexy general, arriving with husband Jamie Mazur.
9. Rosie Huntington-Whiteley shows some leg in her costume.

Rosie Huntington-Whiteley shows some leg in her costume.
10. Evan Ross and his girlfriend arrive ready to party.

Evan Ross and his girlfriend arrive ready to party.