Washington, Nov 2 Singer Mariah Carey is getting ready to put on her Santa suit a month early, as she has been chosen to switch on London's glittering Christmas lights.

Carey, 39, will flick the switch at the U.K. capital's Westfield Shopping Centre later this month.

And she is preparing for her role by looking at videos from her festive hits 'All I Want For Christmas' and 'Santa Baby' so she can stage a dramatic entrance.

"It's going to be Christmas themed. She's been looking back at her Santa Baby video for inspiration. She wants to make it a big eal," Contactmusic quoted a source as telling Britain's News Of The World. (ANI)