Christina Aguilera transforms from Dirrty diva to sexy crime-fighter in a TV advert to promote her greatest hits album.

The singer appears in several superhero guises in the comic-book inspired ad to promote new disc Keeps Getting' Better - A Decade of Hits.

She may be a new mum but Christina certainly isn't toning down her sexy costumes.

The singer looks red-hot as she squeezes her famous assets into a skin tight red P.V.C catsuit and cape.

See Catwoman Christina below