Scarlett Johansson and Keira Knightley Strip for Vanity Fair  2/7/06

Young movie beauties Scarlett Johansson and Keira Knightley have stripped to their birthday suits for the annual Hollywood issue of Vanity Fair magazine.

The Match Point star, 21, and British actress, 20, appear naked alongside clothed designer Tom Ford in a special shoot by legendary photographer Annie Leibovitz.

Originally the issue's guest art director, former Gucci designer Ford decided to appear on the cover when Mean Girls beauty Rachel McAdams dropped out.

Ford explains, "She did want to do it, and then when she was on the set I think she felt uncomfortable, and I didn't want to make anybody feel uncomfortable.

"A lot of women actually, a couple of men, too, wanted to take their clothes off. These are such beautiful people, beautiful women, and who doesn't want to see a bit of them."

In the issue, Angelina Jolie poses naked in a bathtub, while fully clothed George Clooney eyes up a female cast of nearly-nude women.