What, it's never too early for nipples? C'mon, we all have them, what;s the big deal. And, to a pedant, it's not exactly a #freethenipple pic given there's an 'x marks the spot' type scenario going on. If she hand't, the nipple police on Instagram would've taken the image down. True story. 
Kendall Jenner, who managed to remain remarkably quiet on her Instagram during her 20th celebrations, marked her landmark(ish) birthday - AND gaining 40 million Instagram 'followers' - with the following image, captioned: "my favorite photo for all 40 mill of you. genuine happiness...taken by lil Ky @490tx." 

Kendall also too the opportunity to promote her ad campaign for Balmain X H&M, with the range launching today. Form an orderly queue, peeps!