Late night TV is apparently only big enough for one person in tight pants, so Jimmy Fallon challenged Jennifer Lopez and her heavily-insured booty to a pants-on dance-off. Two pairs of tight pants enter, one pair of tight pants leaves.
It's recycled from a bit Fallon did with Will Ferrell back in 2012, with the exact same premise, music, and costumes—just different asses. But the genius of Fallon is that it doesn't matter: He just squeezed "Jennifer Lopez" and "tight pants" into the same sketch, and Jennifer Lopez into some tight pants.
[H/T E! Online]