Kara DioGuardi

It isn’t just Catherine Zeta-Jones’ May cover that’s getting people to purchase Allure’s May issue; it’s the five stars that went all the way for the magazine’s annual “The Naked Truth” photo shoot.

First, there’s American Idol judge Kara Dioguardi, who proudly went from a size 8 to a sexier size 2. “Food is not what I use to anesthetize myself anymore,” she said.

Second, there’s actress Regina Hall, who credited her svelte body to Ashtanga Yoga, which she’s been doing five days a week since the beginning of January.

Third, there’s Emmanuelle Chriqui, one of the stars of Entourage. She may have one of the most sought-after pair of assets, but she revealed, “[I wish] I could have had a dancer’s body.”

Fourth, there’s Grey’s Anatomy’s Jessica Capshaw, who actually doesn’t see herself as super sexy. “I was never a rail-thin person,” she said.

Lastly, there’s singer Colbie Caillat, who initially had worries about her baring it all for Allure. “I worried that it might make [my younger fans] think I was changing somehow,” she said.

I had hesitations about posting those nude photos on Celebrific, so just point your mouse here to see the official slideshow of Allure’s “The Naked Truth.”

Hey, let’s not forget Catherine Zeta-Jones, who also showed a lot of sexiness in the magazine’s photo shoot. Grab your copy of Allure’s May issue, out in newsstands April 20, or check out some behind-the-scenes photos here.