Channing Tatum's 'A Fat Kid On The Inside,' Despite Being The Sexiest Man Alive

He may be People's reigning Sexiest Man Alive, but Channing Tatum admits he's anything but a heartthrob.

The 33-year-old actor, who's expecting his first child with wife Jenna Dewan-Tatum any day now, reveals a long-kept secret in the new issue of Cosmopolitan magazine. Get ready for it ...

"I'm a fat kid on the inside," Tatum admits, laughing that women wouldn't necessarily find him sexy if they knew his eating habits. "I love food so much, and I fluctuate about 25 to 30 pounds between movies. I feel like I have to do a chess movie that requires very little movement at some point, just so I can eat pizza and play chess on the beach all day. And then eat more pizza and cheeseburgers and drink beer. That'd be amazing," he continues, "I'd give anything for that. I gotta figure that movie out."

So, one of the hottest men in Hollywood is a binge eater?! Who knew.

To be honest, Tatum says he's just like any other guy, considering his friends know how to keep him humble.

"It's a hard thing for me to wrap my mind around the C word: celebrity. Rock stars are celebrities, because they're larger than life. As an actor, you have to play the everyman and the everygirl. If you start treating people in the real world like assistants, that's not a good look," he explains, adding, "But my friends keep me grounded. It's embarrassing to tell you how much my friends make fun of me. Seriously, when you have a doll made of your face, it's ridiculous how creative your friends can get … pictures, videos, little animated cartoons that they've made. And they're way, way not PG-13," he jokes, "So I get chopped down to size all the time."

And obviously, depending on the time of year, that size could be buff or, well, BIG.