Hallowe'en celebrations

Actors dressed as Dracula (L) and Frankenstein (C) watch as U.S. President Barack Obama and first lady Michelle Obama participate in a Halloween trick-or-treat on the steps of the North Portico of the White House.

Actors dressed as Dracula (L) and Frankenstein (C) watch as U.S. President Barack Obama and first lady Michelle Obama participate in a Halloween trick-or-treat on the steps of the North Portico of the White House.

Heidi Klum, dressed in an eight-foot-tall "Transformer" costume, arrives at her Halloween Party in New York.

Saskatchewan Roughrider fans dressed in Halloween costumes sit in the stands during first half CFL play against the BC Lions in Vancouver.

A music fan dressed as a zombie waits in line to see Alice Cooper perform his 'Halloween Night of Fear' show at The Roundhouse in north London.

Russell Simmons arrives at Heidi Klum's Halloween Party in New York.

U.S musician Alice Cooper performs his 'Halloween Night of Fear' at The Roundhouse in north London.

A man wearing a costume takes part in a Halloween night parade in the central avenue of San Jose.

A mountain of pumpkins and squash adorn the North Lawn of the White House for Halloween,

Buck Condill of Arthur, Ill., walks on the North Lawn of the White House which is decorated for a Halloween celebrations.