Kendall Jenner pumps up the crowd at the first football game of the school season on Friday night (September 3) in Calabasas, Calif.

The 15-year-old model was joined by little sister, Kylie, 14 — this is her first year on the team!

“Just finished cheering for the first football game of the season! 1st win!” Kylie excitedly tweeted after the game.

The girls also teamed up for a shoot for the new Sherri Hill collection — check out the pics on their official site!

10+ pics inside of Kendall and Kylie…