David Letterman is finally retiring and it’s the end of a national nightmare, say our nation’s presidents.

"Why do people hate Anne Hathaway?" asked Yahoo! Shine. "Why do women hate Anne Hathaway (but Love Jennifer Lawrence)?" posed the Cut. "Why is everyone hating on Anne Hathaway at 2013 Oscars? (TWEETS, GIF)," wondered the Huffington Post. "Is it a gender double-standard - or is it her face?" quizzed Salon.

On tonight's Late Show with David Letterman, NBC news honcho and Gawker correspondent Brian Williams chatter with David Letterman on a variety of subjects, one of which was his kids. When Letterman suggested that Williams might hire his son, as aspiring sports journalist, Williams joked about that being nepotism. Hey Brian, using your celebrity to connect your daughter to Girls producer Judd Apatow is nepotism too.

On tonight's Late Show with David Letterman, Keith Olbermann attempted to explain what exactly went wrong for him at Current TV. He did so with an analogy about a $10 million chandelier being installed in an unworthy building. It's pretty easy to guess who's who in the analogy.

Jon Hamm stopped by the Late Show with David Letterman tonight to ostensibly promote his new film Friends with Kids, but the conversation turned, naturally, to Mad Men, which premieres in just over three weeks. Who's excited?

In the last 10 days alone, two different men have been arrested for vandalizing the entrance to the Ed Sullivan Theater, where the Late Show with David Letterman is taped. Scary! But at least Letterman is taking it all in stride, as you'll see in this clip from tonight's program, which features Today Show anchor Matt Lauer attempting his own theater break-in with a metal trash can.

Two days after co-star Tom Hanks appeared on the same program, Julia Roberts visited the Late Show last night to chat with David Letterman and promote Larry Crowne. As it turned out, there wasn't much movie-related discussion. But there was a whole bit that involved Letterman peppering Roberts with annoying questions about her kids! He also flipped off the audience. The video, above.

Last week, Tom Hanks appeared on Univision's Despierta America morning show and soon found himself in the middle of a weather report-turned-dance party with sexy co-host Chiquinquira Delgado. It was cute! And when Hanks reminisced about the incident with David Letterman on tonight's Late Show, we couldn't help but feel all warm and fuzzy inside all over again.

Justin Bieber may never be overthrown as America's No. 1 teen idol, but that doesn't mean the singer isn't still capable of making cringeworthy television appearances. Take, for instance, Bieber's cameo on tonight's Late Show, during which he indifferently presented the "Top 10 Little-Known Facts About Justin Bieber" for an even more indifferent David Letterman.

Last night, Keith Olbermann reincarnated Countdown on Current TV and it was pretty much the same exact show he had on MSNBC before the network gave him the boot. To call it "new" is a bit of a stretch, but Olbermann stopped by tonight's Late Show with David Letterman to promote the program and read off tonight's Top 10 list, "Reasons to Watch the New Countdown with Keith Olbermann." Video of the segment is above.

Tonight, Cameron Diaz took over most of the Late Show to chat with David Letterman and promote her raunchy new movie, Bad Teacher. And with 25 minutes for Diaz and Letterman to waste together, it was pretty much a given that there would be some awkward moments.

Steve Martin isn't the only big star on David Letterman's Late Show this evening—Alec Baldwin's in the audience! Or was in the audience, that is. You see, once Baldwin found out Martin was on, too, he split.

Spider-Man: Turn Off the Dark, the forever-delayed, utterly doomed musical from Julie Taymor, Bono and the Edge, is still in previews. But that doesn't mean that the cast can't perform a weirdly tame song on David Letterman's Late Show!

Last August, when Brian Williams visited David Letterman on the Late Show, Letterman expressed his concern over Williams' plans to do The Tonight Show. Tonight, in a cranky/endearing way, Letterman blasted Williams for appearing on "the goddamn Leno show."

On tonight's Late Show freshman Tea Party Senator Rand Paul stopped by for an interview. On the whole, the discussion focused on politics—specifically, education, government spending, and tax cuts for the rich. Naturally, the two men disagreed.

Tonight, Anderson Cooper—fresh from his headline-grabbing Egypt trip—stopped by the Late Show to chat with David Letterman about being beaten up by an angry, pro-Mubarak mob. "I don't recommend it," said Cooper. Neither do we. Leave Andy alone!

On tonight's Late Show, Domestic Diva Martha Stewart made some Superbowl treats with David Letterman. One problem: all Letterman wanted to do was bring up Stewart's stint in the slammer. She was not pleased—but she did get revenge!

During last Saturday's Miss America pageant, something magical happened: Miss Arkansas, Alyse Eady, performed a ventriloquism/yodeling act during the talent portion of the competition. Tonight, the runner-up appeared on the Late Show and performed—twice!—for David Letterman. Watch inside.

This morning, Regis Philbin shocked viewers when he announced his impending retirement from his morning show. Tonight, friend David Letterman got Philbin on the phone during the Late Show to sort the whole thing out—and bicker with him.

On last night's Late Show, David Letterman's Top 10 List was "Ways New York City Is Preparing for the Blizzard." T'was mostly kitsch and Mayor Bloomberg-bashing, but—mid-list—Letterman went off on a hilarious tangent about his displeasure with Noxzema.