Credit: Justin Theroux

She likes 'em smooth!

Justin Theroux poses in the October issue of GQ with some serious facial hair. Posing as Frank Serpico (played Al Pacino in the classic 70s film), the 40-year-old actor proudly shows off the full, hipster-friendly beard he sported until early summer.

He explains to the magazine that he grew out the bushy beard for his role as a cult leader in Wanderlust -- where he and costar Jennifer Aniston eventually fell in love an embarked on a relationship. (They're now living together in a rented, $17,500-a-month pad in L.A.)

"You establish all sorts of mannerisms with it," he said of his beard. "Like when you're bored, you can feather your mustache."

When asked by GQ if Aniston, 42, was a fan of the look, he replied: "Certain chicks dig it; certain chicks don't."

As GQ notes, Theroux shaved off his beard a few days after the shoot.

Tell Us: Do you like Theroux with or without the beard?