Happy 39th birthday to the one and only Derek Hough! You may have officially entered your second to last year of your thirties, but let's be real, we all know you'll stay youthful and charming forever. May 17th is definitely a day worth celebrating, because it marks another year of your incredible dance moves, dazzling performances, and overall awesomeness. Cheers to you and all that you've accomplished in your 39 years of life. Keep shuffling and twirling your way through the years, because that's what makes you the amazing Derek Hough. Happy birthday!