David Letterman is on Kathy Griffin's worst-dressed list

On Monday night's episode of the "Late Show," Kathy Griffin revealed David Letterman was on her worst-dressed list -- and Letterman took it like a champ.

"You're on the worst dressed list," Kathy Griffin said on the "Late Show. "Okay, I probably am, and I don't care," David Letterman shot back. "David! It's everything!" replied Griffin.

Griffin is set to replace the late Joan Rivers on "Fashion Police," and Letterman is apparently already pretty high up on that infamous worst-dressed list.

Luckily, Griffin said he can improve -- he just needs to remember to pose for the cameras and maybe taper in his suits a bit.

As for her new "Fashion Police" hosting gig, Griffin said in an interview with the "Today" show that she and Rivers have different tastes, but she'll be continuing in her spirit of fashion critique.

"I will continue, if nothing else, in her fearless style of taking no prisoners. But our styles were different you know, I'm a different human being. I'm more improvisational, and I don't know what I'm going to say," Kathy Griffin explained.

Griffin will be joining co-hosts Kelly Osbourne, Giuliana Rancic and Brad Goreski when "Fashion Police" returns Jan. 12 on E!.

Take a look back at the late Joan Rivers' most stylish outfits:

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