Jenner has repeatedly denied it so we took to her Instagram account and cherry-picked a handful of cleavage photos she's posted over the past 4 years.
I'll leave it to you to decide.
2 November 2015
Back in 2015, when she was just 17, Jenner looks super cute in a Cleopatra style bra. Her boobs look pert and full but has she had a boob job? Unlikely.
2 Feb 2016
A push-up bra makes Jenner look a bit busty here, but her boobs still look natural.
9 March 2016
A family portrait taken for International Women's Day in March 2016 shows Jenner looking fresh-faced and flat chested. Still no implants.
10 March 2016
If she has had implants then this is one of the 'Before' pics. You can see here, Jenner's boobs are flattened by a tight boob tube and her bra size would be something like a 10B.
26 April 2016
Back in 2016, Jenner looked like most 18-year-olds: small boobs, flat stomach. Definitely no fake breasts here.
26 November 2016
Jenner looks great in a bikini. As for her boobs? They look a bit heavier, but that could be down to slight weight gain as she's been constantly telling us for years. "TMI but it's that time of the month," said Jenner in a social post. "They will deflate soon. And it will be a sad, sad day."
31 March 2016
Last forward to March 2016 and all of a sudden va-voom! Jenner's breasts seems to have ballooned. Has she had a boob job? Jenner denied it saying her newfound cleavage was thanks to a Victoria's Secret push-up bra.
24 April 2016
But she's not wearing a bra in this photo and her boobs look huge. At least compared to the photo of her aged 17.
27 Aug 2016
In 2016, Jenner responded to the rumours that she'd had a boob job with a single line. "Do u want to feel them to validate."
20 November 2016
As the 7th most followed person on Instagram with 125million followers – Jenner's assets are constantly under scrutiny. But she continues to deny having implants. "I want to admit to the lips, but people are so quick to judge me on everything, so I might have tiptoed around the truth, but I didn't lie."
13 July 2017
In response to fans questioning her implant status, Jenner posted on her now-defunct website; "No, people, I haven't gotten breast implants! Everyone is obsessed with that. Truth is, as I've gotten older, I've gained 15 pounds and my body has changed; I've definitely filled out."
1 January 2019
Has she or hasn't she? "I'm not against plastic surgery," wrote Jenner in one of her blogs. But, she also said, "I'm also someone who says, 'Never say never.' If, down the line, I get to a point where I'm really uncomfortable with something on my body, I'm not against changing it."
So, has she had breast implants? The jury is still out on that one.