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 Jennifer Lopez as Herself Sheila E. as Herself Beyoncé Knowles as Herself (Beyoncé) Tony Bennett as Himself TLC as Themselves Jack Black as Himself Tim McGraw as Himself Tom Jones as Himself Reeve Carney as Himself Bono as Himself Lil' Jon as Himself Marc Anthony as Himself The Edge as Himself