Kendall & Kylie Jenner: Reality Stars Turned Authors!

Kylie Jenner shows off her adventurous side by riding around on a Segway scooter with friends on Friday (June 29) in Calabasas, Calif.

The 14-year-old model/reality star and big sis Kendall recently announced that they are writing a book together!

PHOTOS: Check out the latest pics of Kylie Jenner

The girls are collaborating with co-writer Maya Sloane on a science-fiction story set 200 years in the future, which is due out next summer.

“We want to do something so different,” Kendall told E! News. “Something that we really love.”

10+ pictures of Kylie Jenner riding a scooter inside…