Kylie Jenner Boob Job Proof: Tyga's Girlfriend Flaunts Racy Bikini Instagram Cleavage, Fake?

Kylie Jenner continues flaunting major cleavage on Instagram, and the "Keeping Up With The Kardashians" youngster hasn't even celebrated her 18th birthday yet!

Earlier this week, rapper Tyga's girlfriend shared this hot-and-steamy bikini snapshot on the popular social networking site:

Pretty curvaceous body for a teen!

Fans can't stop drooling over the poolside selfie, which has already garnered more than 163,000 comments and counting. Wow.

As HollywoodLife.com points out, older sister Kendall actually modeled this same racy swimsuit for a recent shoot with Allure magazine.

Anyway, do MstarsNews readers think that Jenner's acting a bit too mature for her age? Rumors now suggest that Blac Chyna's ultimate "rival" secretly underwent plastic surgury to enhance her smaller figure. According to MediaTakeOut.com, a cyber snitch recently confirmed such "fake boobs" hype online. The account is now set to private, but Anthony Jaurez claims:

ant_900: "My neighbor works for the surgeon they use and she for sure got a boob job... not bad in my opinion."

He also provides photographic evidence, showing how Jenner's cleavage suddenly appears much larger nowadays.

Obviously, Twitter's now abuzz:

@MeganYoungman: "If Kylie Jenner hasn't had a boob job I give up on life"

@KayleighDaisy: "Kylie Jenner has 110% had a boob job."

@mollylambert: "We Need To Talk About Kylie Jenner's Boob Job But We Can't Because She Is Still Seventeen."

@KatiePabros: "I wonder when Kylie Jenner is going to admit her boob job too lol."

‏@desyrockss: "Damn I need whatever bra Kylie Jenner is using since she 'didn't get a boob job.'"

@gilleechi: "I'm not sure if God exists or if we go to Heaven after we die but I can say with absolute certainty that Kylie Jenner got a boob job."

@supatkelli: "no f*cking way, kylie jenner [had a] boob job you can't lie to me i know what those look like."

@stephaniejenae: "I used to shoot down everyone who said @KylieJenner got a boob job but after that last insta video I just don't know anymore."

@blixberrie: "Lol Kylie Jenner went down the route of lying about her obvious boob job. In 2015 there is no shame. It's obvious..."

@_rhiannaw: "So unfair Kylie Jenner didn't experience being an ugly teen like the rest of us. Straight to a boob job and lip fillers man [crying]."

Does this even come as a big surprise anymore, despite Jenner's heated denial?

Oh, and Jenner's turns 18 on August 10.