Hollywood is full of naked ambition

With awards season in full swing, Scarlett Johansson, above, and Keira Knightley have exchanged ballgowns for birthday suits.

Under the artful eye of photographer Annie Leibovitz, the starlets posed nude for the cover of Vanity Fair magazine’s annual Hollywood issue.

Fashion superstar Tom Ford also appears on the cover photo, though he stuck with a more traditional suit – one of black fabric.

Ford, the issue’s guest art director, said he hadn’t planned on becoming part of his own project, but he stepped in when “Wedding Crashers” star Rachel McAdams backed out.

Angelina Jolie also got naked, posing in a bathtub. Another inside shot depicts a fully clothed George Clooney as a director filming a large cast of women wearing skin-tone underwear.

“A lot of women actually, a couple of men, too, wanted to take their clothes off,” Ford said. “These are such beautiful people, beautiful women, and who doesn’t want to see a bit of them?”