According to David Letterman, he was personally picked by the retiring Tom Brokaw to look after Brokaw's successor in the anchor chair at 'NBC Nightly News.' Letterman told Brian Williams about the conversation he had with Brokaw on 'Late Show' (Weeknights, 11:35PM ET on CBS).

"Dave, do me a favor," Brokaw said to him. "Look after Brian."

"In the meantime I see you showing up on the g******** Leno show," Letterman said. "I've seen it! Last week? Funny boy Jon Stewart!"

Williams tried to defend himself by reminding Letterman that 'The Tonight Show' is on NBC, where he works, but that only poured salt in a very old wound.

Brian Williams is a frequent guest on 'The Daily Show' (Weeknights, 11PM ET on Comedy Central) and enjoys as an easy rapport with host Jon Stewart. So much so that Williams feels comfortable giving Stewart advice on self-improvement.

"You know what I did ... knowing something about you? I got these," Williams told Stewart, before putting on a pair of glasses.

"Without them I was a guy who failed to complete my studies at Brookdale Community College in New Jersey. But with them, I went to the Ivy League." Williams claimed, turning toward the audience and posing with his new spectacles.

Now that 2011 is a week old, many people have already either broken or shelved their New Year's Resolutions. You know what we're talking about: you've stopped going to the gym, and you've drowned your guilt in a sleeve or two of Fig Newtons. We understand; we've all been there.

But it seems that some prominent daytime hosts -- and one very funny late night guest -- are determined to make sure their viewers are sticking to those resolutions, or just whatever exercise program they've set up for themselves.

Let's start with Ellen DeGeneres. Today on her nationally-syndicated talk show, she's conducting the entire show from a recumbent bike, and guests Ryan Gossling and Camille Grammer joined her.

On the fourth hour of 'Today' (weekdays, 7AM ET on NBC), Kathie Lee Gifford and Hoda Kotb host the show while working out on stationary bikes as a way to encourage exercise among viewers. Seth Rogen, who drops by to promote 'The Green Hornet,' also climbs aboard a bike and similarly feels the burn.

Assault with a "pimp cup" is still assault. Just ask 'Rock of Love Bus' finalist Brittanya O'Campo.

According to E! Online, O'Campo has been sentenced to six months in jail following an attack on another woman with that they call a "pimp cup." The VH1 star is accused of hitting the woman in the face with her chalice. O'Campo pleaded guilty to felony assault and misdemeanor battery for the altercation that happened in November 2008.

O'Campo sent this message to her fans via Twitter: "I will be locked for 6 Monthes. I can only get PostCards, no letters or packages. If you send books they have to be from Borders.com Softbac" [sic].

On 'Rock of Love Bus,' the third season of the Bret Michaels reality dating competition, O'Campo was sent packing by the Poison frontman when she attacked another contestant.

In other TV news ...

• Those looking forward to seeing Snooki drop from the sky in Times Square will be disappointed this New Years Eve. Times Sqaure officials have reportedly put a kibosh on MTV's plans to drop the pint-sized 'Jersey Shore' star in a "hamster ball." The stunt will happen, just in Seaside Heights. [Zap2It]

• The first North American 'The Vampire Diaries' fan convention is upon us! Eyecon will hold the 'TVD' convention in Atlanta, Georgia on March 25-27. So far Paul Wesley and Rob Pralgo are confirmed talent. Tickets are on sale now. [Zap2It]

• Brian Williams and 'NBC Nightly News' beat out the competition in ratings during the fourth quarter of 2010. NBC trumped rivals CBS and ABC with 8.72 million viewers. 'ABC World News' hosted by Diane Sawyer pulled in 7.56 million and 'CBS Evening News' with Katie Couric grabbed 5.79 million. [Live Feed]

A few weeks back, the gang over at 'Today' (Weekdays, 7AM on NBC) did a fun video take on the Black Eyed Peas "I Gotta Feeling." With will.i.am on the show today, Kathie Lee and Hoda took the opportunity to show him their video, which he said he'd seen online.

"When I was watching it," he said. "I was looking for edits. Wow, they did no edits." As they were talking, the video footage of their video was playing on a split screen. When it panned down to evening news anchor Brian Williams dancing backwards, Gifford and Kotb started laughing even harder.

"What'd you think of Brian Williams?" they asked. "Has he got some moves or what?"

"That's gonna be a new dance," will.i.am concluded. "Just call it the Brian Williams." He then proceeded to get up and show the ladies his take on Brian Williams' move. If the first video went viral, this one might just follow suit, and we may soon see people in the clubs doing the Brian Williams. Maybe will.i.am will bust it out onstage at the next Black Eyed Peas concert.

Jon Hamm's favorite sketch from his two times as host of 'Saturday Night Live' involved Will Forte, when Forte was a Halloween trick-or-treater costumed as a child molester. "It was hilariously awkward, and Will does that very well," Hamm told former 'SNL' cast member Jimmy Fallon on 'Late Night' (weeknights, 12:37AM ET on NBC).

But that skit was originally meant for 'NBC Nightly News' Anchor Brian Williams. The newsman saw its rehearsal on the intra-network NBC feed and sent a personal message to them saying, "Why is there some idiot in a Charlie Brown sweater doing my sketch? Lose my number! Love, Brian Williams."

Maybe Williams was just jealous that he didn't get to spend time with Hamm while he was in proximity. He loves the actor and 'Mad Men.' Fallon warned, "You gotta watch it when you're in this building ... He watches the feed. He could show up wherever." At that moment, the cameras panned to the studio door, with a fanatic Williams peering through the window. Hamm's reaction? "That's just sad."

There's one talk-show guest whom David Letterman wants all to himself: 'NBC Nightly News' anchor Brian Williams. He gets jealous when Williams visits other talk-show hosts, specifically his West Coast competitor. "I don't like it when you go on that show," the 'Late Show' (weeknights, 11:35PM ET on CBS) host said possessively. Williams countered: "That's funny, because [Jay Leno] doesn't like it when I come here."

"Does he give you a car every time you go out there?" Letterman asked, then mocked Leno's high-pitched delivery. No, but Williams has had a firsthand glimpse of Leno's famous garage. Hmm, Letterman can't compete with that. Williams wanted to leave "topic one" but Letterman persisted. So the newsman smartly turned the tables. "Why is Regis [Philbin] so obsessed with your life?" he asked. Letterman had a response to that.

Don't you just hate having to go into work when it's a holiday? Either you have to come in because you are supposed to, or you used up all your off time on that whirlwind trip to Graceland and can't spare the day. It's a sucky feeling, to tell you that much; no one's on the street, your favorite coffee shop and/or lunch spot are closed, and the office sounds as quiet as a church.

But what if you don't remember it's a holiday and come into work anyway? Think that can't happen, that people mark these holidays on their calendars in January and hold them so precious that the day is embedded in their brains?

Well, it happened to Brian Williams. If you were surprised to see him manning the desk on 'NBC Nightly News' last night, he was equally surprised that Monday was a holiday and that he was supposed to take the night off.

If Brian Williams isn't careful, he might be known as a funny comic who also does the news instead of the other way around. Last night he popped up again on 'Late Night with Jimmy Fallon' to help Fallon slow jam the news. Williams can keep a straight face but Fallon can't.

[Watch episodes of 'Late Night' and other shows at SlashControl.]

Can health care reform be sexy? Jimmy Fallon and NBC Nightly News anchor Brian Williams gave it their best shot on 'Late Night with Jimmy Fallon' (weeknights, 12:37AM ET on NBC).

With a lounge beat and smooth backup vocals from house band The Roots, Jimmy and Brian "slow jammed the news" and cracked a couple jokes along the way. Snap your fingers and sway to the beat.

Watch the video after the jump.

While NBC has been mired in a public bloodbath over job changes among some high-profile employees, ABC has quietly and smoothly managed the job transition between two of its biggest on-air personalities, Charlie Gibson and Diane Sawyer. Not only did Sawyer's replacement of Gibson last month as anchor of 'World News' occur with a minimum of fuss and strife, but it also has met the network's goal, at least so far, of a ratings boost for the nightly newscast.

So Diane Sawyer took over for Charles Gibson last night on ABC's World News. I don't know how "important" her first episode was. She's filled in on the show before and obviously wouldn't suddenly start yelling expletives or start drooling. She handled herself fine (though if I want to see a chick read the news I watch Katie on CBS). What did everyone else think?

When NBC was promoting Brian Williams' fifth anniversary as anchor of the NBC Nightly News, I figured it was a good opportunity to ask him a few questions. After all, with two wars, a lousy economy, the health care debate, and Tiger Woods, there's lots of news going on right now.

And, in such a relatively short period of time, the news landscape has changed on both the broadcast and the cable fronts, including the fact that on Monday, when Diane Sawyer takes over ABC's World News, he'll be the only male evening news anchor left.

Williams (or as he's been called lately, BriWi) was nice enough to answer some questions via e-mail about his new competition and how he lets his famous sense of humor come through during a serious newscast. Finally, he gives me some insight into what he's listening to right now (if you've seen previous interviews with him, he leans more towards the college radio side).

Though the U.S. is a young nation -- just 233 years old if you trace it back to the Declaration of Independence in 1776 -- the settling of the continent goes back four centuries or more.

With that in mind, the History Channel will premiere 'America: The Story of Us' in 2010, an epic 12-part series examining how this nation of average citizens, not royalty, have determined its course from the very beginning.

According to Variety, Meryl Streep and Michael Douglas are among a starry list of narrators confirmed for the series, which draws talent from Hollywood and politics. Other narrators will include former Secretary of StateColin Powell and NBC anchor Brian Williams.