Comedy Central will finally see some girl-on-girl roasting: Kathy Griffin will serve as Roast Master at Comedy Central's Roast of Joan Rivers, the network announced. The pairing is the first all-female Roast Master and Roastee in the franchise's history.Joan Rivers ," Griffin said in a statement. "I mean, not that Pam Anderson wasn't a comedy legend or anything... Let's just say it will be an evening of highs and lows. I will be roasting Joan with more gentleness and tenderness than her latest chemical peel and, on the other hand, I will give her a verbal pap smear and God only knows what I'm going to find down there."The comediennes are longtime friends. Griffin made an appearance on the Celebrity Apprentice finale to help Rivers, who won the top prize.The Roast of Joan Rivers will air Aug. 9 at 10 pm/ET.