Happy birthday, Colin Farrell!

The actor turns 37 today, and while he's still lookin' pretty damn good for his age, we can't help but remember him back in his prime.

That's why we're bringing you some of the sexiest Colin pics for this week's Hot Guy Friday! We've rounded up the best the shirtless and studly shots we could find. (You're welcome.)

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What's your favorite thing about Colin?