Christina Aguilera Glams It Up

Mommy is looking fierce!

Xtina has signed on to star in an Alfred Hitchcock-inspired ad campaign for London-based jeweler Stephen Webster, and the first few images—destined for the April issue of W magazine—have just surfaced.

"Stephen and I have been friends for many years, and working together on this campaign and collection has been an incredible experience," said Aguilera, who's also credited as the designer's muse.

Next up for Webster, how about some baby-inspired accessories for li'l Max?