Who knows JT better, his wife Jessica Biel or his friend Jimmy Fallon? (Photo: NBC, Andrew Lipovsky / NBC)

On Thursday, Justin Timberlake's wife, Jessica Biel, and her long-time friend, Jimmy Fallon, tested their knowledge of JT in what the host of the night called "The Best friend challenge. "

In the first round, they were asked to identify the two favorite rappers of the singer. Given that Fallon and Timberlake have performed several duos "History of Rap" in "Late Night" and "The Tonight Show", one would think that he would have had a definite advantage over this one.

And you would be wrong. He misunderstood Run DMC while Biel gave the correct answer: Andre 3000 of Mase and Outkast.

Bienne 1, Fallon, 0.

In the second round, everyone had to guess his favorite cocktail.

Fallon started suspecting something when Biel asked his second question in a row.

"What is a tequila mullet?!?" he asked Timberlake after revealing the correct answer. "We drink gin and tonic, that's what we drink! You do not like what I do for you?"

While Timberlake wriggled silently, Biel shared the recipe for tequila mules: tequila, ginger beer and lime on the rocks.

Determined to catch up, Fallon demanded to move on. But the next question was definitely not in his wheelhouse: "What is my safeword?"

The Roots presented the audience with their best theme music while Biel and Fallon wrote their answers.

Fallon actually got the right one: "Pineapple"

That surprised Biel as much as he did.

"What ?!" she asked in disbelief.

"How on earth did that happen?" Fallon asked. "Things have become strange."

To see who the winner is, watch the video above.

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