One of the great things about 'The Tonight Show Starring Jimmy Fallon' is how the host gets the biggest of stars to act completely silly. It must be his 'Saturday Night Live' experience that allows him to make A-list celebs feel comfortable and let down their guard.

And that's exactly what Jennifer Lopez did when she appeared on Monday night's show (June 9), as the singer and Fallon did a hilarious skit titled 'Tight Pants.'

The main gag of the segment was seeing both stars wear the tightest pants anyone could probably squeeze into, and then gleefully sing about it. Fallon came out first, dressed in a mod outfit of snug white jeans, and Lopez followed him wearing pretty much the same. But for some reason, J.Lo's tight pants looked a whole lot better.

Both of them were also wearing hilarious-looking Beatles wigs to complete the 60s-mod-look. However, the funniest part of the skit was the banter the two shared in between singing. After they argued for a while about who had the tightest pants in town, Lopez reminded Fallon of her "Jenny From the Bronx" roots.

"Listen up you little bitch," barked the flawless beauty. "You better hide your wife, you better hide your kids, because I will cut you. I will cut your father, I will cut your mother, I will scratch you. Don't make me take off my heels."

After a few more comedic threats, the 'I Luh Ya Papi' songstress picked up right where she left off -- singing about her tight pants and pulling off some corny dance moves. This was definitely one of the more hilarious skits Lopez has taken part in while hitting the late-night circuit.