Ben Affleck with Bieber Hairstyle?

While stars like Channing Tatum and Matt Damon are shaving their heads, Ben Affleck is at the other end of the spectrum: He's growing out his hair.

The actor stepped out in Santa Monica, Calif. on Monday sporting a shaggy new 'do that channeled a certain 17-year-old multi-platinum pop star.

But for those wondering if the actor has a case of Bieber Fever (he does have two daughters after all), they'll be relieved to know that his straighter, longer locks can be attributed to a movie role.

The 38-year-old actor, who has rocked a cleaned-up crew in the past, has been skipping the routine haircuts for his new film Agro -- a thriller in which he's starring, directing, and co-producing.