Jimmy Fallon brought back his "Camp Winnipesaukee" sketch on Tuesday's "Tonight Show," an act first introduced when the entertainer hosted "Late Night," Entertainment Tonight noted. And Fallon got some help from a special guest when singer and actor Justin Timberlake dropped by.

The sketch has the two pretending to be their younger selves as they "blatantly ignore their summer-camp curfew," the website said. Props include braces and terrible wigs, and the duo "celebrates with off-key renditions of popular '90s songs."

Set in 1997, the camp features the nerdy teenagers having some fun as they play "truth or dare," E! Online detailed.

"Truth or dare: Do you have a crush on anyone?" Fallon asked Timberlake. "Yeah," his sheepish buddy answered. "Who is it?" the host insisted. "Kimmy Gibbler from 'Full House!'" the guest admitted.

Eventually, TIME magazine revealed, the conversation turns to music, and Fallon and Timberlake "launch into a beautiful rendition of Third Eye Blind's 1998 hit, 'Jumper,'" the magazine added.

Timberlake has filled his days in New York with activities, Entertainment Tonight said: He attended Taylor Swift's birthday party, performed "Holy Grail" with Jay Z and cried over a young fan in a moment captured in a viral Internet video.

For the 33-year-old, December has proven an exciting month on a personal level, as well. He and his wife, actress Jessica Biel, are expecting the couple's first child, Timberlake former 'NSYNC bandmate Joey Fatone told InTouch.

"He told me a while ago, and I kept my mouth shut," Fatone said, according to the Huffington Post. "But now I can talk about it!"

Timberlake and Biel, who married in 2012, cannot wait to be parents, the singer added. "Jessica is awesome, and Justin is a kid at heart," Fatone said. "(They'll have) fun," he said.

Aside from the Timberlake-Fallon sketch, Tuesday's "Tonight Show" also featured rapper Nicki Minaj, who delighted viewers with some tales of what her life was like before rising to stardom, Rolling Stone noted.

"I was an office manager, and I would kind of call out any time I wanted," Minaj told the host. She also worked as a waitress, she added, though she admitted her customer service skills were lacking.