Guest Stars Carrie Underwood as Herself Scotty McCreery as Himself Lauren Alaina as Herself Lady Gaga as Herself Haley Reinhart as Herself Steven Tyler as Himself Sheila E. as Herself Jennifer Lopez as Herself Beyoncé Knowles as Herself (Beyoncé) Tony Bennett as Himself TLC as Themselves Bono as Himself Jack Black as Himself Tim McGraw as Himself Tom Jones as Himself Reeve Carney as Himself Marc Anthony as Himself Lil' Jon as Himself The Edge as Himself