Kate Walsh's New Man Revealed

Grey's Anatomy star Kate Walsh has been coy about the new man in her life, recently telling People he's "a great guy, but I'm not giving you a name."

But now the mystery has been solved.

Walsh, 39, is dating Alex Young, a production co-president at 20th Century Fox, with a string of big-time credits to his name, including X-Men: The Last Stand and Fantastic Four.

"He's a hotshot," says a friend. "But Alex also has substance. He's a good guy."

Walsh, who stepped out with Young at an April 28 fund-raiser for Barack Obama in Los Angeles, has become pretty hot herself.

On Thursday, she starred in a two-hour special episode of Grey's Anatomy, "The Other Side of This Life," which featured her character, Dr. Addison Montgomery, contemplating a move to another hospital.

The storyline is the basis for a possible spinoff starring Walsh, Taye Diggs and Tim Daly.

And Walsh, who was most recently romantically linked to Brothers & Sisters star Dave Annable, recently told Best Life magazine she's a late-bloomer in love, but is finally ready for a serious relationship.

"I don't need someone with a hot body," she said.

"He can be fat or overweight and have a belly. It's very much about style and substance and humor, interest, curiosity and really being smart."