Kylie Jenner has been posting semi-naked selfies and other pics that test the limits of Instagram's no-nudity policy for quite some time now.
But this past August, Kylie turned 18, which means 2015 will forever be known as the year that the youngest Jenner sister took her seductive poses and barely-there attire to a decidedly adult level.
It's impossible to pick just one photo that the reality star posted as the most shocking, and some of her pics were actually surprising for how modest they are.
(We figured Kylie would get tattoos this year. We didn't imagine you would need a microscope to see them.)
So check out the gallery below for Kylie's most memorable Instagram posts of 2015. We're guessing she'll push the envelope even more next year...but we have no idea how that's possible.
Kylie Jenner: Bikini and Fur Boots
Kylie Jenner recently posted a photo of herself in a bikini and fur boots. Not surprisingly, it quickly racked up hundreds of thousands of likes.
Kylie Jenner and Her Butt
Kylie Jenner shows off her rear end in this Instagram photo. She does this often online.
Kylie Jenner Seduces Followers
Kylie Jenner wrote that she had a "broken nail" in this photo. But why do we think no one is really looking at her nail?
Kylie Jenner, Bikini-Clad
We feel so dirty looking at this photo. Yes, Kylie Jenner has a banging body. But she's 17 years old here!
Kylie Jenner Side Boob Photo
Kylie Jenner is flaunting some serious side-boob in her latest Instagram pic. The reality star turned 18 just last week.
Kylie Jenner: Birthday Boobs!
Tyga posted an incredibly racy photo of Kylie Jenner to celebrate her birthday. Yes, it's racy even by Kylie's standards.
Kylie Jenner's Flat Stomach Secret
Kylie Jenner recently shared her "flat tummy secret" on Instagram. As you might've expected, it's total BS.
Kylie Jenner: Hot Selfie
Kylie Jenner posts another hot selfie of her increasingly hot self. At least that's how she wants us to view her, clearly.
Kylie Jenner Leggings Photo
Kylie Jenner rocked a pair of leggings while running earrands in LA recently. Now, the company that made them is reporting record sales.
Kylie Jenner Butt Photograph
Kylie Jenner is just leaning over while wearing a bikini in this photo. No big deal. Feel free to stare at her buttocks if you'd like.
Kylie Jenner Waist Training
Kylie Jenner is taking after her sisters in this photo. She's waist training and setting a bad example for young fans.
Kylie Jenner Waist Training Image
Kylie Jenner is still waist training. Worse, she's still encouraging her fans to do the same.
Kylie Jenner Spanx Photo
No butt implants here! Kylie Jenner swears she just uses Spanx to highlight her famous rear end.
Kylie Jenner Butt Padding Photo
Kylie shared a photo on her app to prove to the world that she's not padding her butt. This is what her subscribers get for their monthly fee.
Bikini Selfie by Kylie Jenner
Hi there, Kylie Jenner! Thanks for giving us this look at yourself in a black bikini.
Kylie Jenner Bikini Snapshot
Kylie Jenner would like to give you a look at her bikini body. Here you go. Here it is.
Kylie Jenner Thighbrow
Of course Kylie had to get in on the thighbrow trend. She even did hers standing up.
Kylie Jenner in Lingerie
Kylie Jenner posted a photo of herself wearing lingerie on Instagram. Sure, she's 18 now, but many fans still believe the pic is too racy.
Kylie Jenner Bikini Photo, Take 179!
Another day, another Kylie Jenner bikini photo. Anyone else bored by the repetitive nature of these?
Kylie Jenner Is a Snow Princess
Kylie Jenner chose two costumes for Halloween 2015, one of which was a snow princess.
Kylie Jenner in Mexico
Kylie Jenner chills out here during a vacation in Mexico. That is definitely some underboob we see hanging out, right?
Kylie Jenner in Braids
Kylie Jenner rocks some cornrows in this photo. Are you a fan of the look?
Kylie Jenner is Now 18
Kylie Jenner posted this racy photo on Instagram on the occasion of her 18th birthday. So that makes it less shady to ogle over... right?
Kylie Jenner "Eat Me Out" Shirt
Yes, Kylie Jenner is at least wearing a shirt in this Snapchat video still. But look at what the shirt says.
Kylie Jenner Cleavage Close-Up
This is a close-up of Kylie Jenner's cleavage. Keep in disturbing mind: the star is only 17 years old here.
Kylie Jenner: Booty Photo
Kylie Jenner posted yet another photo of her butt recently. This time, some fans have observed that it appears to be smaller than usual.
Kylie Jenner: Bikini on Instagram
Kylie posted yet another bikini photo on Instagram. In other words, it was Tuesday.
Kylie Jenner or Kim Kardashian?
This is a photo of Kylie Jenner at 17 years old. She looks JUST like Kim Kardashian, don't you agree?
Kylie Jenner Tattoo
Kylie Jenner has a new, unique tattoo. What do you think of these etched-on piece of ink?
Kylie Jenner Underwear Selfie on Instagram
Kylie Jenner posted some racy pics to Instagram recently. The weird thing is, she seems to be wearing someone else's underwear.
Sexy and She Knows it
Kylie Jenner makes no bones about the fact that she is hotter than hot these days. Kris must be so proud.
Kylie Jenner Boob Grab
Raciest Kylie Jenner photo ever? The 17-year old is grabbing her own breasts in this snapshot.
Kylie Jenner Takes a Self-Portrait
Kylie Jenner turns the camera on herself for this Instagram photo. The reality star does that often.
Seductive Kylie Jenner
Kylie Jenner posted this photo on her Instagram account in May of 2015. Need we remind you that she's only 17 years old?
Kylie Jenner Boob Alert
Could this be Kylie Jenner's most risque photo to date? We've asked that question a lot, but come on: that IS under boob showing, right?!?
Kylie Jenner Body Photo
This seems about right for Kylie Jenner on Instagram, doesn't it? It's a close up of her bikini body.