Dancer Cheryl Burke was the first professional dance partner to win two seasons (back-to back). She and former 98 Degrees member, Drew Lachey won season 2. In season 3, she and NFL legend Emmitt Smith won. Julianne Hough became the second professional dance partner to complete such a task. She and Apolo Ohno won season 4 and her and underdog Helio Castroneves closely beat out Melanie Brown for the Season 5 title.
Julianne Hough is the youngest professional dancer ever to have competed and win the overall title on the show at age 18 (season 4) with Apolo Ohno, and at age 19 (season 5) with Helio Castroneves.