|USA||2005||120||Family . Music . Game-Show|
Julianne Hough returns to the show as a guest judge as the contestants face their toughest challenge yet. In a series-first, they switch partners for the competition based on the home audience's Twitter votes. The episode also saw the return of the Macy's Stars of Dance, choreographed by Derek Hough.
|Episode Title:||Week 4: Switch-Up Night|
|Airs:||2014-04-7 at 08:00 pm|