Who knows Justin Timberlake the best? Jimmy Fallon has a little game to find out.

Who knows Justin Timberlake the best, truly? Is it his wife, Jessica Biel, or his buddy, Jimmy Fallon? Or, is it YOU?

The married stars joined Fallon for the "Best Friends Challenge" on The Tonight Show on Thursday night, for a good old fashioned test of "who knows you better?"

The late show host and Biel attempted to answer questions about Timberlake, who couldn't really talk after having bruised vocal chords. 

Who is his all-time favourite rapper? What's his go-to cocktail? What does any of this mean and how can we use it to solve the mysteries of the universe? Find out. Read more...

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via Tech Republiq