So much for Jon Hamm's new look.

Just when Mad Men fans were getting used to seeing Don Draper with a beard, the actor shaved it off!

Hamm -- who said he'd been "utterly lazy" about staying clean-shaven while on hiatus from the hit AMC show -- was last photographed with scruff on Saturday but looked fresh-faced in new promos for his upcoming Saturday Night Live hosting gig. (Watch clips above.)

Still, there's one person who may be upset Hamm, 38, is now going without whiskers.

When asked how the beard affected his longtime love Jennifer Westfeldt, he said, "Amazingly!"