Gaga, Osbourne Lash Out at Each Other In Letters

A mother-daughter, letter-writing battle has erupted between Lady Gaga and her mom Cynthia against Sharon and Kelly Osbourne, both accusing the other of bullying.

This feud was fueled when Kelly commented on Gaga's Little Monsters treatment toward her, calling the singer's fans "the worst" in a recent magazine article.

Gaga, 26, then responded with an open letter to Kelly on her website, lashing out at the TV star's E! show Fashion Police, writing in part: "Your show breeds negativity, and over the years has even become comedic in nature. It glorifies you and Joan Rivers pointing in the camera, laughing, and making jokes about artists and celebrities as if we are zoo animals."

Commenting on Kelly's weight loss, Gaga, 26, wrote: "To see you blossoming into a beautiful slender woman who makes fun of others for a living is astounding. Why not help others? Why not defend others who are bullied for their image and share your story?"

Needless to say, Kelly's mother Sharon was none too thrilled with these comments. Taking to her Facebook page, the 60-year-old Talk co-host wrote: "I am calling you a bully because you have 32 million followers hanging on your every word and you are criticizing Kelly. ... Are you so desperate that you needed to make this public?"

RELATED: Kelly: I Think Gaga Is Pregnant

You say her work on E! with the Fashion Police is 'rooted in criticism, judgment, and rating people’s beauty against one another.' Welcome to the real world," Osbourne continued. "Example, when I saw you wear a dress made out of raw meat, I was sickened. When I see you wearing fur, and using it as a fashion statement, the fact that defenseless animals have been killed so you can get your picture in the press is abhorrent to me. Shouldn’t you be teaching your 'little monster' fans to respect animals and life? I don’t feel I have to justify Kelly’s choices in life to you."

RELATED: Sharon In Reality Show Feud

Whose side are you on? Let us know, below.