Live” will be celebrating its half-century birthday this weekend with a big celebration. SNL alum will join an A-list group of actors, comedians and singers Sunday night for the “SNL 50: The Anniversary Special” from Rockefeller Center.

Former "SNL" cast member Jimmy Fallon, host of "The Tonight Show, " is emceeing the event." The Roots will also hop over from studio 6B to perform as musical guests in the star-studded setlist. Lorne Michaels,