She is growing up too fast and taking after her older sister Kim.
The 17-year-old star flashed her underwear to Instagram followers in a snap imitating belfies made famous by her sister Kim Kardashian.
While she kept covered up a lot more than her older half-sis, Kylie adopted a similar look as she posed for the camera.
Looking over her shoulder at the mirror and flashing her underwear, the star said she was ready for bed as she took the picture.
She wrote: “Staying comfortable in my @meundies Time to jump in bed after this long week. (sic)”