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Ryan Gosling has some hotness competition on the set of his directorial debut, "How to Catch a Monster" -- from "Doctor Who" hottie Matt Smith.

The English actor, who stars as the title time traveler on the popular BBC show, was seen filming with Gosling on Monday in Detroit, Michigan.

And his famous locks are long gone! 

While Smith sports an impressive head of hair as The Doctor, he buzzed it all off for the film. It's a very different look ... but kinda sexy, right?

Click the gallery above to vote for which look you prefer.

And because no story mentioning Ryan Gosling would be complete without a photo of him, here you go (he's the one with the camera):

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