Kylie Jenner's bigger bust is down to hormones, not surgery.

The 19-year-old Keeping Up with the Kardashians star has set the record straight after photos emerged showing her with a seemingly inflated chest. Wearing a skimpy white top with high waisted jeans, Kylie’s ample cleavage spills over the top of her shirt in the Instagram shots, with many people speculating she’d gone under the knife. However, Kylie put an end to rumours on Friday (26Aug16) as she answered fans’ boob-related questions.

“Um never,” she told a fan on Twitter who asked if she had surgery on her cleavage, adding to another: “TMI (too much information) but it's that time of the month lol (laugh out loud).”

She also got flirty with one fan, inviting @kyliejenlove to feel her chest to validate it's all real, before admitting her breasts are likely to return to their normal size after she’d finished her period.

“They will deflate soon. And it will be a sad sad day,” she joked.

And fans who want to emulate her look are out of luck, as Kylie revealed her favourite Victoria’s Secret bra is no longer available.

He chest wasn’t the only thing on Kylie's mind though; the TV star also shared her excitement over her new lip kits.

"Okay enough boob talk lmao (laugh my a** off)," she posted. "Can't wait for my new lip kits tomorrow !!!!!!!”

As well as her famous family, Kylie has also become known for her huge pout, which she initially put down to clever make-up before finally admitting she had them surgically enhanced. Making the most out of her fuller lips, Kylie launched her first lip kit in 2015, which was an instant hit.