Watch Kathy Griffin Tell David Letterman He's on the Worst-Dressed List

"I don't care," responds the late-night host

Kathy Griffin doesn't like the way David Letterman dresses, and she's not afraid to tell him to his face. Griffin stopped by the Late Show on Monday and told Letterman he was on her "worst-dressed list."

Letterman's response? "Okay, I probably am, but I don't care." Then the late-night host joined Griffin on his stage to walk around posing like they were at prom together.

Read more Kathy Griffin to Continue Joan Rivers' Style of 'Taking No Prisoners' on 'Fashion Police'

Letterman wasn't the only man Griffin insulted last night. She also mercilessly mocked Ryan Seacrest while recounting the time she spent with him and Anderson Cooper. Watch her antics below.