Tim Riggins, what have you done?!

"Friday Night Lights" star Taylor Kitsch was sporting a brand new 'do on the set of his new movie the other day -- and he's gone blonde!

The actor, who had long brunette hair on the NBC football show and buzzed it for his role in "Battleship," showed off his peroxide-tinted head of hair while filming "The Normal Heart" in NYC on Tuesday.

The flick centers on the HIV-AIDS crisis in New York during the '80s, which explains the actor's "American Psycho"-eqsue ensemble.

What do you think of his new look? Vote in the gallery above.

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