Just over seven years after Conan O?Brien bid adieu to the program, Jay Leno, the former Tonight Show host who preceded both O?Brien and current master of ceremonies Jimmy Fallon, will return to the program in April. According to People, Leno joins a rather large assortment of guests whose names include The Fate of the Furious? Vin Diesel and Dwayne ?The Rock? Johnson (but not together), Shaquille O?Neal, Scott Eastwood, Pitbull, Blake Shelton, Nicole Richie, Flo Rida, Jason Derulo and Ty Dolla $ign.