Kim Kardashian is obsessed with her butt, according to a new report by Closer magazine (via the Daily Mail). A source told the British magazine that Kardashian has allegedly spent thousands to plump up her derriere.

"Kim's been focusing on her butt a lot lately - it's becoming almost obsessive. She says the bigger it is, the sexier she feels. But Kim's obsession is starting to worry her friends - they're concerned she'll take things too far," the source said.

"Kim says she wants an eye-popping booty that everyone notices," the source added. "It's part of her brand."

The 33-year-old mother of one definitely does have an "eye-popping booty" and is often the subject of butt-enhancing rumors. Recently, Kardashian posed in a two-piece bikini for a photo shoot in Thailand, which prompted critics to question whether her backside was real.

There's no doubt that the "Keeping Up with the Kardashians" star has been sporting a bigger butt lately. When Kardashian caught wind of the rumor, she angrily took to her personal blog to deny the allegations saying that her fuller figure is due to pregnancy weight (she gave birth to her daughter North West in June) and she was still working on shedding the pounds.

"I'm seeing all these nonsense tabloids claiming I have butt implants-injections. Get a life! I still have weight to lose. Anyone who has had a baby knows how hard it is to lose weight (especially the last bit of weight) & your body totally changes!"

The reality star was responding to a previous report by Closer that claimed that she had received butt injections following the birth of her daughter.

"Kim hasn't had implants," the source told the magazine. "She's had the fat from her tummy and thighs taken out by lipo, then injected into her bottom. She also wears padded knickers sometimes."