VIDEO : Demi Lovato Joins Jimmy Fallon for Latest 'Ew!' Sketch

Demi Lovato played the co-star to Fallon's "Ew!" character Sara, one of her besties named Emily.

Sara and Emily discussed their upcoming Spring Fling dance.

Fallon actually got to No. 26 on the Billboard Hot 100 in 2014 with a musical version of "Ew!," featuring Will.i.am.

Lovato is set to release new music Friday, when she and EDM trio Cheat Codes will release their "No Problems" collaboration.