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Family . Game-Show . Music

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