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29 May 2013, 13:10 | Updated: 29 May 2013, 13:18
The Fashion Police host has criticised the pop star for the way she handled their altercation earlier this year.
Kelly Osbourne has reignited her feud with Lady Gaga after describing her as a "great big hypocrite" and suggesting she is using the "freaks and geek" to further her music career.
The two stars engaged in a war of words back in January this year after Kelly accused Gaga's fans of bullying her online, leading to open letters being exchanged between the 'Marry The Night' singer and Kelly's mum Sharon.
Kelly has now opened up about her feelings on the US pop star, and suggests Gaga was wrong in how she handled the situation.
"I loved Lady Gaga, I totally believed in everything she stood for, until I realized she's a great big hypocrite," Kelly reveals in the new issue of Cosmopolitan magazine. "Don't say, 'When you see bullying, intervene', while letting your fans send me death threats.
"If my fans did that, I would not stand for it," Kelly explained. "You can say whatever you want with your millions of monsters, I know the truth.
Check out a picture of 'Born This Way' singer Lady Gaga below (Credit: Twitter):
"Your bells and whistles mean nothing to me. You're feeding on the freaks and geeks to further your career?
"Do you really care about the gay community? Because if you did, you'd stand up for it more than you do," Kelly added.
The US singer made her return to the stage earlier this month after her hip surgery three months ago, when she performed a duet on stage in New York with jazz musician Brian Newman.
Lady Gaga is due to begin ramping up the promotion on her new album 'ARTPOP' this summer ready for a potential release in Autumn.