Derek Hough, aside from having a "hot" sister, is also a Dancing With The Stars fan favorite, and last night he proved what a pro he really is.

This week he and Ricki Lake scored the first perfect 10s of the season from the judges, and he also danced with his sister Julianne, Oh and did I mention that Derek did all that with a dislocated shoulder?

According reports Derek dislocated his shoulder in rehearsals yesterday, saw a doctor and decided to dance through the pain and perform as planned.

Former 'DWTS' pro dancer Julianne, who returned to the ballroom last night to promote her role in the upcoming 'Footloose' remake, Tweeted that "It's kinda crazy how Derek & I danced for the first time after I had surgery & how this time His shoulder was injured The show Must go on!!"