Kendall Jenner finally did what so many of us can't do -- she shoved her little sister Kylie so hard the 17-year-old reality starlet fell over!

On Tuesday the girls were working on a photo shoot in Malibu (presumably for their Pac Sun apparel line), and we're not sure why Kendall was running around in a robe, but when the two sisters were jogging side by side she gave Kylie a push. The younger Jenner then completely ate it, and an assistant immediately rushed to help her up. It probably wasn't Kendall's intention to give her little sis a mouthful of sand, but she definitely laughed after watching Kylie take a tumble!

Still, it looked like everything was fine a few minutes later, as the sisters were able to shake it off and smile for the cameras: