Another day, another reason to drop your jaw over Kylie Jenner.

Today it's her new blue hair we're focusing on, although from the looks of her outfit from last night, it could also be her cleavage … which was hanging out for all to see.

The 17-year-old debuted her cotton-candy locks at the Bellami Beauty Bar in West Hollywood for the launch of her new hair extension line.

kylie jenner

But this isn't the first time Kylie's changed up her hair — click through to see her transformation through the years in the gallery above!