Justin Timberlake shares adorable pictures of baby son Silas on The Tonight

Later, Timberlake, 34, sat down for an interview with Fallon and discussed his five-month-old son Silas Randall, whom he shares with wife Jessica Biel, 33.

However, he was enthusiastic about fatherhood, adding that it was “the most insanely wonderful, most attractive, unbelievable thing that can ever happen to you”.

He also proudly revealed his son’s first word was “da-da”.

First, they have the “History of Rap” thing going on in “The Tonight Show” and now this – dancing to Beyonce’s chart topping hit, “Single Ladies” at the U.S. Open, Wednesday night. The precious little boy has the flawless combination of daddy and mommy Jessica Biel.

While his duets with Timberlake are now legendary, Fallon has gone a step further when it comes to showcasing his love for rap music.

Jimmy Fallon and Justin Timberlake are BFFs and Timberlake regularly joins Fallon on his show for sketches.

In addition to bearing his babe on The Tonight Show, the 34-year-old performed the History of Rap – Part 6, which was, put simply, amazing.

Watch Ellen DeGeneres and Jimmy Fallon face off in a “Tonight Show” lip sync battle, and tell us what you think. His comedic talents are being totally wasted on all that new music we’re still waiting for.

Jimmy was dressed in a suit while Justin had his own take at a suit, consisting of trousers, white shirt and a blue blazer.

More detailed ratings – including viewership numbers – will be released by the networks later in the day. At one point, Timberlake said, “Jimmy, you were Straight Outta Compton!”