Here are some the most amazing Halloween costumes worn by celebrities last October 31, 2009.
Left: "Twilight" stars Kellan Lutz and Ashley Greene in Robin and peacock costumes.
Right: Seal and Heidi Klum in black bird feathers.
Left: Nick Cannon and Mariah Carey in Angel Halloween Costume.
Right: Paris Hilton and Doug Reinhardt Angel Halloween Costume also.
Left: Heidi Montag and Spencer Pratt in Jon/Kate Gosselin looks.
Right: Jessica Alba as Dora the Explorer
Left: Audrina Patridge in a Genie Halloween costume.
Right: Gwen Stefani dressed as a cow girl.
Source: OMG