Chris Rock

David Letterman tells jokes at others' expense for a living. This week, he got a taste of his own medicine from a worthy comedic adversary, Chris Rock.

Suffering from both a hoarse voice and a cold, Letterman gave Rock ample material for mercilessly mocking the talk show host's messy personal life.

"Dave, what the hell happened to your voice?" he asked. "You sound like an old ass man. You're still doing the show? You're rich, you could go home!"

Then Rock joked in reference to Regina Lasko: "Wife still mad at you, ain't she? I get it. Why drive back to Connecticut? Just do the show with no voice!"

Chris Rock turns the tables on Letterman.

Letterman took it in stride, and Rock later noted: "I've been there, man ... When I'm on the road, I just add on shows! We're doin' Roanoke tonight!"

Rock then continued his barrage, saying Dave "fired all the cute girls" that used to be backstage. Now it's just "a bunch of fat old guys," he lamented.

Of course, Letterman had a comeback, "some of them are starting to look pretty good." Follow the jump for some clips from the amusing exchange ...

Chris Rock can't get a major nutjob off his back.

Despite DNA tests proving he is not the father of Kali Bowyer’s child, she is moving forward with a book that still claims the boy is Chris Rock's.

In the press release Kali Bowyer circulated for her upcoming book, Hollywood Child, she she had “a hot affair with racy comedian Chris Rock.”

Her life, according to the release, “started crashing down all around her,” until “getting pregnant with Chris’ son saved her life.”

Rock’s attorney said, “There is a final judgement. This is not Chris Rock’s child. It’s been fully litigated, and that includes DNA testing.”

Kali Bowyer? Not normal. No, really, she's nuts. TMZ is reporting that she has a history of trying to run scams - and she apparently really sucks at it!

From 2005-present, she has been convicted of DUI in Georgia, charged with theft by deception, facing charges of running an elaborate cellphone scam, writing bad checks, and causing several domestic disturbances. Ouch.

She also once claimed to be kidnapped and force to take some white powder, but that story got messed up when they asked her son what happened.

Chris Rock never stood a chance.

Last night - at Madonna's benefit to raise awareness/money for the plight of those in Malawi with AIDS - the comedian attempted to walk right past Rihanna. He failed.

A celebrity gossip photographer caught Rock in full ogling mode. But can you really blame the guy?

Pssst, Chris: visit The Hollywood Gossip at any time to check out photos of Rihanna nude! That way, you can drool away in private.