It's been known since April that David Letterman would retire in 2015, with Stephen Colbert as his successor, but the date was up in the air until now: Letterman will host his final Late Show on May 20, 2015, ending his run at 6,028 episodes, reports Dave Itzkoff of the New York Times.

Aaron Sorkin's distinctive style of dialogue has been parodied to death. You could even argue he's been parodying himself for years now. So what's Seth Meyers supposed to do with Sorkin as a guest, when Amy Schumer and SNL have already defined the Sorkin-spoof genre?

John Oliver, who had to resort to comedy after he realized he would never be a professional soccer player, is still completely obsessed with English football, and happy to spend an entire interview explaining the game's various leagues—premier, peasant, Downton Abbey—to a confused David Letterman.

Bill Hader stopped by to chat with his old pal Seth Meyers on Late Night last night, where the two reminisced on their weepy SNL parting and the faux Stefon-Seth wedding. Known as a character primarily comprised of Hader breaking into laughter, he explained that the reason Stefon always put his hands up to his face…

Many were furious at figure skating's suspicious judging yesterday. But another great competitor was shut out of a medal entirely: Will Ferrell, who did an entire Downton Abbey routine in a skintight butler costume on Tonight yesterday.

Now, what you hear is not a test: this is NBC News' Brian Williams and Lester Holt, rapping the classic old-school hip-hop track "Rapper's Delight," originally by the Sugarhill gang.

Jimmy Fallon's guest on last night's Late Night was Alec Baldwin, and the two, as it turns out, go way back.

Between permanently kidnapping The Roots and producing the god damn endless popular cover song medleys that every god damn asshole wants to share with you on Facebook, you might have thought that mop-headed giggler Jimmy Fallon's show had reached Peak Irksomeness. Wrong!

On Sunday, NBC stunned no one by announcing Jimmy Fallon's eventual Late Night replacement: long-time Saturday Night Live head writer (and current Weekend Update anchor) Seth Meyers. The stunning part happened next, on the network's official Twitter handle.

Three years after NBC pulled a hilarious prank on Conan O'Brien by convincing him to move across the country and then, when he got there, promptly setting him on fire, the network has chosen a new fair maiden to sacrifice to the ravenous monster of late night television programming: Jimmy Fallon.

The best part about this "sequel" to Abbott and Costello's classic "Who's on First" routine starring Jimmy Fallon, Billy Crystal, Jerry Seinfeld, and A.D. Miles, is how great it is.

Walking out onto the set of Late Night with Jimmy Fallon to the tune of the theme song from Diff'rent Strokes, actor Fred Willard last night made his first public appearance since being arrested for lewd conduct inside an adult movie theater in Hollywood.

One upon a time (2002), in a land called VH1, a then-beardless Zach Galifianakis had his own late-night talk show called Late World with Zach that was canceled after nine weeks.

In case you missed it: Late Night with Jimmy Fallon host Jimmy Fallon and Magic Mike's Channing Tatum star as best besties Sara and Susie in Teen Nick's new teen talk show for teen girls, Ew!

On tonight's Late Night, Lena Dunham revealed that she once wrote a play wherein she switched bodies with Jimmy Fallon and then they fell in love, which means that she falls in love with her own image like a mumblecore Narcissus. An additional takeaway: she was at a party with Fallon when she was 17 which in no way…

Last night I attended a midnight showing of the Avengers. I'm not particularly into the Marvel movies (never even saw The Hulk or Thor, so sue me), but it was a friend's birthday and it sounded fun and I thought, Hey I'm fun, I'm young. Sure I'll go.

Lindsay Lohan is hosting Saturday Night Live this week and stopped by Jimmy Fallon's show to make sure everyone knows about it. Before reminiscing about the classic Debbie Downer sketch that they all giggled through during her first hosting appearance, Lohan talked about how she ended up doing the show this time…

Jon Stewart swung by Late Night with David Letterman and naturally the topic turned to politics. During the discussion, Stewart explained exactly what it is that the GOP doesn't like about Mitt Romney: he's trying to be Rick Santorum and failing miserably.

Tonight David Letterman celebrates 30 years on the air. It's been quite a ride for old Dave, through different timeslots and networks, from the peak of zeitgeist to something else entirely. He's hosted starlets and politicians, often treating them with a dash of anger and more than a bit of sarcasm. Here are some of…