Simon Cowell's X-Factor is in trouble. Lady Gaga, who is due to perform live in this series, might pull out of the deal after one of the judges Sharon Osbourne called the "Applause" singer vile, bully and a hypocrite in her latest the autobiography.

The 60-year-old, who is one of the judges at the show, accuses Gaga of encouraging her fans to torture daughter Kelly with online abuse. The drama started when Gaga wrote an open letter to Sharon's daughter Kelly Osbourne, criticising her show Fashion Police.

Gaga called Kelly a beautiful woman but expressed her discomfort at her show's strategy where Kelly pokes fun at the fashion sense of celebrities.

"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. What about your body revolution? It used to make me truly sad when I would hear people talk about your weight when you were younger, as I was bullied too," Gaga wrote in a open letter to Kelly which she posted on Twitter.

"To see you blossoming into a beautiful, slender woman who makes fun of others for a living is astounding," Gaga added.

Kelly had earlier called Lady Gaga as "great big hypocrite feeding on freaks who should stand up for gays more." The judgement didn't go out well with Gaga's fans or Monsters. They even issued threats to Kelly for her death!

Lady Gaga - Marry The Night on X Factor UK

Source: youtube.com/ladygaga

Now Kelly's mom Sharon believes that Gaga could have ended the hate of Monsters against her daughter is she wanted to but "Marry the Night" singer chose to keep mum.

"I am calling you a bully because a word from you would stop all the vile threats to Kelly," Sharon said.

The Lady Gaga-Kelly/Sharon-Osbourne feud is now keeping Gaga's performance on X-Factor in jeopardy.

"Sharon didn't hold back in her comments and there is now a very real concern Gaga might just pull out of the show," a source revealed to Daily Star.

If Gaga does pull out of the show, the chances are that X-Factor will suffer losses in terms or TRP's too. What do you think of the whole fiasco? Should Gaga show up her maturity and perform in spite of the negative comments of Sharon or should she pull out?