Jennifer Lopez reportedly is not a fan of Kim Kardashian, or her rear end. The 44-year-old diva, who is as well known for her large backside as she is for her professional career, is said to be tired of Kardashian being talked about and fawned over for her assets.

“Jennifer is sick of all the talk about Kim’s butt and how much attention she gets for her curves. She thinks it’s pathetic, because she believes it’s blatantly obvious Kim’s had some type of lift or treatment to get such a gigantic bottom that sticks out like it does,” a source tells National Enquirer.

Kardashian has long been rumored to have gotten butt implants, and in 2011, she defended her famous derriere by getting a butt X-Ray on her reality show, to prove that it has not been enhanced with injections.

"My sisters have dared me to get a butt X-ray," Kim told her doctor, as sisters Kourtney and Khloe looked on. "I really just want to get [it], so I can show the whole world." It turns out her butt was real, but that was nearly three years ago.

Today, butt implants seem to be the new version of getting a nose job, so it is plausible. Many women, not only those in urban music videos, seem to be opting for the popular plastic surgery procedure.

Additionally, the curvy star has been seen hanging out a lot lately with Blac Chyna, a former stripper who is now married to rapper Tyga. Blac  Chyna is known for her surgically enhanced derriere, and other body parts. Kardashian has denied rumors that she has had plastic surgery as recently as last November, but her most recent pictures may tell a different story.

Lopez is said to be frustrated that Kardashian is known for her butt when it may not be completely real, while the singer has a naturally curvy behind.

“Everything about Jenni­fer’s body is natural. She’s proud of her shape and the work she’s put into it through years of sweat and dedica­tion in the gym. She’s old-school about this stuff and doesn’t think Kim deserves all this adulation when she’s so plastic and such a total fake.”