Lady GaGa blasted blogger and former pal Perez Hilton during a fiery radio appearance on Tuesday morning (12Nov13), revealing the gossip king left her in tears during a terrible interview.

The pop superstar told shock jock Howard Stern she felt so betrayed by Hilton she decided to end their friendship on the spot in 2011.

She said, "We were doing an interview... and in the middle of the interview he started asking Me really terrible questions. He was being very negative about (album) Born This Way and we had had a lot to drink. He was supposed to be my friend and I felt betrayed, so I started crying. My friend had to come in and pull the camera out, they wouldn't turn the cameras off.

"He apologised, but I sort of felt like it was like, 'But I'm Perez Hilton so I'm allowed to treat you this way'. I looked at him and said, 'Just because you are who you are, does not mean that our friendship doesn't mean anything when the cameras turn on. So, now I see who you really are.' And I was done after that."

Gaga told Stern that Perez has since become a foe, adding, "He's just mad that I don't want to hang out anymore. I don't want to be around fake people. I really believed, when I first met him, that he wanted to change. I really believed that he wanted to bully people less on his site and that he wanted to move into a more positive space. I was really there for him and I really supported him."

Everything came to a head when the singer learned that Hilton was reportedly keen to move into her New York City apartment block.

She added, "He lied and told everybody that he wasn't stalking me, but that next day - after I asked him to leave me alone - he put an offer in on two apartments in the building! Why do you need to live in my apartment (building)?

"If you hate me, hate me from over there. Continue to fire away on your blog and your Twitter."

It seems her radio remarks have re-ignited her feud with Hilton, who took to shortly after the Stern interview aired and wrote, "@LadyGaga So you called Me fake on the @HowardStern this morning. Ha! Thanks for the laugh! Have you looked in the mirror lately???."

He added, "@LadyGaga And I was the one who pulled away from u after I realized what a real-life vampire you are! It's been your M.O. (method of operation) your whole career!"