What's The Big Frigin' Difference?!

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Can you see through our sneaky switcharoos in these two photos of Derek Hough ?! Before the Hollywood hottie hits the ballroom, he made a pit stop! Who's ready to tackle the changes?! The clock 's ticking!

The dancing pro was in New York City earlier this week -- making the media rounds to promote his big return as judge on "Dancing With The Stars." Hough hunk-ed out in a form-fitting polo and khaki trousers.

It's the weekend, and there's only one direction permitted: take a left turn and then check out the gallery! Mr. Hough is waitin' for you 🕺 ... ACTION!