Instagram's "Free the Nipple" campaign blew up late last year thanks to support from celebrities like Rihanna and Cara Delevingne. But leave it to the 15-year-old daughter of Will and Jada Pinkett Smith to post the most attention grabbing nipple 'gram in January of 2015.

Shining a light on the debatably sexist Instagram regulation to flag photos of women's (but not men's) nipples, Willow posted this portrait of herself in a conservative turtleneck printed with the image of a topless woman. The post inspired a category 3 hurricane of controversy surrounding Willow's age, which in itself begs the question: Exactly how young is too young for someone to question anti-feminist policies while not actually showing her boobs?

Controversial or not, we're pretty fascinated by the Smith children and have not forgotten this Instagram post nearly a year later.

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When the bewildering #ThighBrow trend surfaced late this summer, half of us rolled our eyes hard and half of us finally found our favorite hashtag of the year. (We're still going back and forth.)

Rebelling against the unattainable thigh gap, the #ThighBrow (not to be confused with #EyebrowsOnFleek) refers to the folds at the top of each thigh that might curve around a high-cut bikini bottom, basically signaling that one has a big booty.

#ThighBrow was (and continues to be) absurd, but we have a love-hate relationship with these sort of hyper-specific Instagram trends. We don't necessarily expect #ThighBrow to come back next year, but as a 2015 Insta-trend, it deserves to be remembered.

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Okay, so we're a little biased about this Instagram post. But most of us can probably agree that Gwen Stefani and Urban Decay announcing their new makeup collaboration was one of the year's most exciting beauty moments.

Only six Instagram accounts in the world got to break the news, and @TotalBeautyEditors was one of them. We've since gotten our hands on Gwen's highly anticipated eye shadow palette (which launched and then promptly sold out on November 22), and it has made us all the more excited for the rest of the collection.

Selena Gomez was body-shamed on Instagram this summer after a series of paparazzi shots revealed that the 23-year-old had acquired a few (beautiful, healthy) curves since her days as a Disney Channel child star. Baffling, we know.

Instead of shying away from the trolls, Selena instantly retaliated with one of the hottest, most body-positive Instagrams of the summer. "I love being happy with me yall #theresmoretolove," she captioned the spicy shot.

Selena's unapologetic confidence earns this Insta-moment a spot in our top 4.

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2015 was the year of Kylie Jenner's Instagram account -- and more specifically, the year of Kylie Jenner's lips on Kylie Jenner's Instagram account.

In May of this year, the Insta-famous baby Kardashian finally admitted to plumping up her lips with fillers. (The Internet was as shocked as the earth is flat.) Then in August, we were amused to learn that Kylie doesn't take the hullabaloo surrounding her pout too seriously.

On the afternoon of the VMAs, Kylie posted this hilarious meme of her post-filler lips ascending like the winged goddess they are, up and away from her pre-filler lips. "Mood today #VMAs," she captioned.

What exactly did Kylie's post mean? Hard to say. But we felt the irony, and we deeply enjoyed it, landing this Instagram moment among the year's top 3.

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