[s4e1] Christina Aguilera Tribute -

The episode featured a head-to-head competition between and Erika Jayne , with a surprise guest appearance by Christina Aguilera herself. Key Performances

: Performed a tribute to Aguilera's hits, including a highly choreographed routine. [S4E1] Christina Aguilera Tribute

: Competed with his own high-energy lip sync performances. The episode featured a head-to-head competition between and