VIDEO : Jimmy Fallon and Justin Timberlake Dance at the US Open

Drunk in love or simply flawless? Justin Timberlake shared new photos of his 5-month-old son, Silas, and brought back some rap history to The Tonight Show on Wednesday, Septenber 9, but boy, oh boy, that was nothing compared to his dancing chops on display at the US Open. The "Mirrors" singer and host Jimmy Fallon crushed the competition when they shook their bums to Beyonce's "Single Ladies" from their seats. The longtime pals were prompted to put down their beers and entertain the crowd when Queen Bey's 2008 smash came on the PA system at the Arthur Ashe Stadium in the middle of a match between Roger Federer and Richard Gasquet.