Don't let the candy-colored hair and the ear-to-ear smile on the cover of Cosmo fool you; Kelly Osboune is still as feisty as ever, and she's not afraid to tell people off. And even though Lady Gaga is not a new target for the "Fashion Police" star, she's calling out the pop singer again in the latest issue of the magazine.

"You can say whatever you want with your millions of monsters. I know the truth. Your bells and whistles mean nothing to me," Osbourne said. "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."

Lady Gaga has long been an advocate for the LGBT community, co-founding the Born This Way Foundation with her mother and launching social-media site LittleMonsters.com for her fans to express themselves online. But Kelly says there's more to the story.

"I loved Lady Gaga. I totally believed in everything she stood for, until I realized she's a great big hypocrite," she told the mag. "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."

The death threats Osbourne referred to stem from an episode of "Fashion Police" where she chastised Mother Monster for skipping the red carpet at the 2012 Grammys.

"Being part of the music industry is walking the red carpet," Kelly said on-air. "You say hello to your fans and you give back to those reporters and those people who supported you. And when you go to an awards show and you don't walk the red carpet, I find that disrespectful."

After that comment, the E! star started receiving many death threats and other unfriendly messages on the site, which led her to tweet, " i have been told to die,suck d---, get raped & that i look like i have aids by @ladygaga fans no wonder they get called bullies."

After the incident, Gaga pointed her finger right back at Osbourne, writing in an open letter: "Your show breeds negativity, and over the years has even become comedic in nature," Gaga wrote. "It glorifies you and Joan Rivers pointing in the camera, laughing, and making jokes about artists and celebrities as if we are zoo animals." But in the end she apologized for her fans. "I cannot control my fans, and I discourage them from any negativity and violence, because that is wrong and hurtful -- and I do feel badly that your feelings were hurt."

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Osbourne's Cosmo interview is one of the few mentions Lady Gaga has gotten all year. After canceling her Born This Way Ball in February due to a hip injury, Gaga has gone nearly invisible, popping up occasionally after surgery with pictures and debuting her golden wheelchair.