Jennifer Lopez on Jimmy Fallon

Jimmy Fallon and his Tight Pants were upstaged yet again, this time by Jennifer Lopez, who gamely shook it in her own pair of tight, white pants. One guess who won this tight-pants showdown.

An even crazier musical mash-up went down on "Late Night With Seth Meyers," where Lena Dunham donned a platinum wig for her oddball performance to Sia's "Chandelier," which involved knocking over cardboard cutouts and unrolling toilet paper while Sia herself laid face down in a bed.

Meanwhile, over on "Chelsea Lately," "Game of Thrones" star Lena Headey owned up to drinking and tweeting a lot of "bull****." Chelsea Handler admitted her own habit of catching up with "Game of Thrones" episodes -- she's only on season one! -- while on Percocet. "You're going to need more Percocet," advised Headey.

Over on "Late Show With David Letterman," Kelsey Grammer shared a photo of a superfan who had his face tattooed on her arm. Quipped Letterman, "Does a person like this need some direction in life, ya think?"

And in case you thought Tom Cruise was going to just repeat everything he did last week over and over for eternity, a la "Edge of Tomorrow," tonight's "Jimmy Kimmel Live" (on which Cruise guested) was a rerun.