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In an interview with Howard Stern, Rivers said that Dunham’s relaxed attitude toward her weight sends the wrong message.

“You are sending a message out to people saying, 'It's okay. Stay fat. Get diabetes. Everybody die, lose your fingers.'”

Rivers claimed she was a fan of Dunham’s work, but doesn’t like her clothing choices, such as dresses that reach above the knee.

“I'm saying if you look the way you look, Lena -- and that's fine and you're funny -- but don't say it's okay that other girls can look like this,” said Rivers. “Try to look better. Try to look better!”

However, Dunham has said in the past that when it comes to her appearance, she has a “Zen body philosophy.”

Dunham told the Gothamist: “I'm sort of like: we're one weight one day, we're one weight another day, and some day our body just doesn't even exist at all! It's just a vessel I've been given to move through this life. I think about my body as a tool to do the stuff I need to do, but not the be all and end all of my existence. Which sounds like I spent a week at a meditation retreat, but it's genuinely how I feel.”

Reach Staff Reporter Alex Reed here.