Aguilera Rocks London

7/21/2006 12:35 PM PDT

Aguilera Rocks London

Christina was looking hot as she got ready for an exclusive gig at London's Koko club, sharing her Marilyn Monroe imitation with the Brits.

Aguilera is across the pond to promote her upcoming CD, Back to Basics, which definitely mirrors her new pin-up look.

"With each record I like to change a challenge myself and evolve in to a new thing," she said, "a different sound and a different look ... Specifically getting visual influences from the 20's, 30's and 40's to go along with sound and look and feel so it's a lot of fun."

The singer opened the show with her first single from the album, "Ain't No Other Man" and played a 40 minute set to a packed crowd. Her album comes out August 15th.