Kim Kardashian shocked the world when she revealed her post-baby body in her first bikini picture that showed her large butt, but many have speculated if the reality star got some work done to enhance her backside. 

The 32-year-old Keeping Up With The Kardashians star looked flawless in the selfie she posted on Instagram Thursday of herself dressed in a skimpy white bikini. But, many are still scratching their heads wondering if she had work done after giving birth to North West. 

"Unless you're one of the blessed people - and there aren't a lot of them out there, and most of the ones I've seen are Brazilian - very few women look like this after pregnancy... No one has just weight gain in their buttocks, so it seems pretty likely she's had some work done. Implants, whether buttock or breast, don't change, but if there is sagging skin around them they may look different and may require a lift of the surrounding skin," Dr. Steve Fallek, a New York City-based plastic surgeon said, according to HollywoodLife.com.

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Another doctor, Dr. Jennifer Walden, a Texas-based cosmetic plastic surgeon said that while "four months is quite early to have procedures done," it is likely that Kardashian used alternative methods of plastic surgery. 

"A lot of non-invasive modality fat reduction and skin tightening such as Venus Freeze don't requite going under the knife, and have downtime after surgery," Dr. Walden said. 

Kardashian previously proved to her fans that her butt was indeed real after she got an X-ray performed on her family's reality show. But Life & Style reported the X ray was all a cover-up.

"Kim had lipo on her legs and the doctor moved the fat into her butt. That's why it didn't show up on the X-ray," a source said.

Click here for some throwback photos of Kardashian when she was much slimmer and Paris Hilton's BFF.

Tags: kim kardashian Plastic Surgery