Haters gonna hate.

Kelly Osbourne** has been open about her struggles with her weight in the past, but even though she's in a good place now -- both physically and mentally -- some naysayers are still itching to bring her down.

"I'm the thinnest I've ever been and the healthiest I've ever been. The totally insane thing is that I'm a UK size four to six and people still say I'm fat," she said in a recent interview with the UK's Fabulous magazine. "I get called fat all the time. A big fat whore."

"Lady Gaga's fans are the worst," she continued. "They've said I should kill myself, that they hope I get raped. I mean, it's crazy but I've had this all my life and I just try and ignore it."

Gaga's fans were particularly incensed when the outspoken red carpet host mused that the pop singer, 26, might be pregnant after her noticeable weight gain at the 2012 Grammys.

"I have no filter," Osbourne said. "I say what I think and that's it. I actually think she's a good singer but she has the worst fans in the world and you have a responsibility to stop that. I think you do anyway."

Osbourne, 28, famously lost 65 pounds during her spin on the dance floor as a competitor on Dancing With the Stars in 2009. She's kept up a healthy lifestyle ever since with a combination of workouts and a more regulated diet.

"I lost weight with the dancing and by actually eating properly," she told the magazine. "I haven't put it back on. I still exercise every day, even just for 15 minutes, but I'm careful with what I eat, I read the labels."

And the former reality show star has a little help from her chef boyfriend, Matthew Mosshart, as well. The vegan chef helps to keep Osbourne's insecurities in check, she said.

"He's amazing. I couldn't believe that he truly liked me because I never think people ever could, but I'm so happy," she shared with the magazine. "I don't think I've ever really known what love is like before."

This article originally appeared on Usmagazine.com: Kelly Osbourne: "I'm the Thinnest I've Ever Been ... And People Still Say I'm Fat"