Helloooo, Kylie Jenner.

The 17-year-old reality star reminded the world that she wasn't the same tween she was when she started filming 'Keeping Up With the Kardashians,' posting a jaw-dropping, cleavage-baring photo of herself on Instagram.

The sultry shot (which you can check out here) depicts the youngest Kardashian-Jenner in one of her most grown-up poses yet, flaunting her ample cleavage in a dangerously low-cut tank emblazoned with a winged skull and the phrase "Motor Triumph." Her makeup is flawless, and Kylie flaunts that enviable glow with a matching color palette in shades of peach: A coral bronzer with a sweep of perfectly matched eyeshadow and nearly nude lips. Her flowing black locks cascade down her back -- except for the artfully posed bangs, which hang seductively over one eye, making her look like a brunette Lindsay Lohan or a seductive Jessica Rabbit.

Kylie further sent tongues wagging with her mysterious caption, which reads: "@joycebonelli Secret Projects," tagging the family's good friend -- and makeup artist! -- in the post.

While we're not exactly sure what Kylie has up her sleeve, with a picture like that, we bet that fans everywhere will be tuning in (and constantly refreshing her Instagram) to find out.

See Kylie Jenner + More Stars Without Makeup