Rivers has responded to Gaga's claims that show 'Fashion Police', hosted by her and Kelly Osbourne, 'breeds negativity'.
Rivers claims the 'Born This Way' singer is merely trying to get attention, reported New York Post online.
"Anyone that would wear a pastrami dress or sit in an egg should know about humour. She knows exactly what's she's doing. She's not selling. We haven't been talking about her until now," Rivers said.
"It's time to start laughing. We've been doing this for fifty years. Tell Lady Gaga to worry about the maggots in her brain from the meat dress! But I told Kelly that it's all good because it means Lady Gaga watches 'Fashion Police'," she added.
The drama stems from Osbourne's comments last October when she said, "Lady Gaga's fans are the worst" and accused them of encouraging her to commit suicide, she also claimed the pop superstar had a duty to step in and stop their comments.
In response, Gaga penned a lengthy open letter on her fan-based social networking site, LittleMonsters.Com, addressed to Osbourne, saying she discourages her fans from any negativity and violence but feels Osbourne's show promotes bullying.