Singer Justin Timberlake helped late night host JIMMY FALLON open THE TONIGHT SHOW STARRING JIMMY FALLON on Wednesday (09Sep15) by joining the comedian for one of their now-famous history of rap performances. The two friends ripped through hip-hop hits made famous by Jay Z, Will Smith, the Beastie Boys and LL Cool J, Kendrick Lamar and N.W.A. The Suit and Tie hitmaker also showed off new pictures of his five-month-old son Silas with wife Jessica Biel during the show.