Justin Timberlake & Jimmy Fallon Sing Alanis Morissette's 'Ironic' In 'Tonight Show' Summer Camp Sketch - Watch Now!

Justin Timberlake is all smiles while making an appearance on The Tonight Show Starring Jimmy Fallon on Wednesday (October 26) in New York City.

The 35-year-old entertainer paired up with his bestie Jimmy, 42, to reprise their hilarious Camp Winnipesaukee sketch, this time trying their best to sing Alanis Morrissette‘s “Ironic” without laughing.

PHOTOS: Check out the latest pics of Justin Timberlake

Later that same evening, Justin and Jimmy played a round of the Best Friends Challenge to prove how well they know (or don’t know) each other – Check it out after the cut!

Click inside to watch the rest of Justin Timberlake’s appearance on The Tonight Show…