Lisa Rinna didn’t think twice about posing in Playboy at her age.

“I’m 45 years old. I look good right now. Why not?” she tells Extra. “Why not celebrate the beauty of the female body?”

See photos of stars who are 40 and fabulous.

Rinna says she’s happiest in the buff.

“I never feel more comfortable than when I am naked taking pictures,” she says. “I don’t know what that’s about. It’s the…