By Breaking Celebrity News Staff

Kathy Griffin has a killer body and she wants the world to know!

The 51-year-old has worked hard to lose weight and firm up and now she just can't stop flashing the results at every chance — Thursday night she stripped off for David Letterman and his Late Show cameras.

When the comedienne arrived at the studio she looked demure, dressed in a one shoulder black shift dress, but she soon shed the outerwear to show off the underwear.

Letterman prompted the strip routine by asking Griffin about her New Year’s Eve CNN broadcast where she appeared at one point in just her black lacy bra. Her strip down prompted close friend, and co-host Anderson Cooper to ask to camera: “Are you freaking kidding me?”

But Letterman didn’t appear so shocked, even hel