As if Jimmy Fallon and Justin Timberlake creating their sixth installment of "History of Rap" last night on "The Tonight Show" wasn't hilarious enough, the two have now pulled out their best Beyoncé moves for the entire U.S. Open crowd.

The 40-year-old talk show host and the 34-year-old singer kept the entertainment going on Wednesday night in New York, according to E! News. While watching tennis pros Roger Federer and Richard Gasquet play on the court, "Single Ladies" started playing, and the two just couldn't contain themselves from reenacting the dance moves from Beyoncé's popular video.

As usual, Fallon had a hard time keeping a straight face while the two broke out the legendary choreography as the announcer says, "I'd say one of the highlights of the night, at least on the perimeter, has been Fallon and Timberlake dancing to Beyoncé."

This isn't the first time we've seen Timberlake do this dance, either. He and Beyonce created a hysterical reenactment of the video with some "SNL" members in 2009.