The 17-year-old reality star posted a snap to her Instagram page, showing off blonde locks from a recent shoot.
In the shot, her trademark straight brunette tresses are nowhere to be seen, and she instead sports a dirty blonde mane along with vampy make-up.
Due to her frequent selfie taking, we're guessing this blonde moment was more the result of a wig or clever lighting, rather than a permanent change to the light side.
Still, we think this could be a new look for the Kardashians, who tend to keep their hair as close to their natural colour as possible.
Kylie, who is the younger sister of model Kendall, and half-sister to Kim, Khloe, Kourtney and Rob, often experiments with her look - like many girls her age.
Just last weekend the star posted a snap of her bright green locks, with a link to her Bellami extensions included in the caption.