The hit 'Grease: Live' musical was full of surprise cameos - from Boyz II Men to Joe Jonas

Fox's take on the live musical, "Grease: Live," aired Sunday night and was an Internet hit. 

The adaptation of the musical (and 1978 John Travolta film) featured Aaron Tveit and Julianne Hough in the lead roles of Danny and Sandy, as well as Vanessa Hudgens, Keke Palmer, Carly Rae Jepsen, and Carlos PenaVega. 

But many fans were most excited to see cameos from the film's original Frenchy and Doody (Didi Conn and Barry Pearl) and none other than Boyz II Men. 

Here are the cameos featured in "Grease: Live":