Kendall and Kylie Jenner

by SheKnows
Aug 22, 2011 at 7:09 p.m. ET

1 /17: Kylie and Kendall with their dad, Bruce Jenner, in 2008.

1/17 :Kylie and Kendall with their dad, Bruce Jenner, in 2008.

2 /17: Looking much grown up in a family photo, Kendall and Kylie look very high-fashion.

2/17 :Looking much grown up in a family photo, Kendall and Kylie look very high-fashion.

3 /17: The Jenner-Kardashian clan celebrating their RedBook appearance.

3/17 :The Jenner-Kardashian clan celebrating their RedBook appearance.

4 /17: Kim, Kylie, Kendall and Kourtney at the Nickelodeon Kids Choice Awards.

4/17 :Kim, Kylie, Kendall and Kourtney at the Nickelodeon Kids Choice Awards.

5 /17: Looking tall and fabulous, Kylie and Kendall go to the People's Choice Awards with their sisters.

5/17 :Looking tall and fabulous, Kylie and Kendall go to the People's Choice Awards with their sisters.

6 /17: Kendall Jenner modeling a bikini line.

6/17 :Kendall Jenner modeling a bikini line.

7 /17: Kendall Jenner starting her modeling career.

7/17 :Kendall Jenner starting her modeling career.

8 /17: Kendall modeling for Marcc T-shirt line.

8/17 :Kendall modeling for Marcc T-shirt line.

9 /17: Kendall and Kylie Jenner at the Never Say Never premiere.

9/17 :Kendall and Kylie Jenner at the Never Say Never premiere.

10 /17: The girls at the 2010 Teen Choice Awards

10/17 :The girls at the 2010 Teen Choice Awards

11 /17: Kendall and Kylie pose with Kris Jenner at the Kardashian Kollection for Sears Launch Party

11/17 :Kendall and Kylie pose with Kris Jenner at the Kardashian Kollection for Sears Launch Party

12 /17: The Jenner-Kardashian family in the early seasons.

12/17 :The Jenner-Kardashian family in the early seasons.

13 /17: Kendall Jenner modeling Marcc T-shirts.

13/17 :Kendall Jenner modeling Marcc T-shirts.

14 /17: Kylie and Kim posing on the red carpet.

14/17 :Kylie and Kim posing on the red carpet.

15 /17: The Kardashian Redbook photo spread.

15/17 :The Kardashian Redbook photo spread.

16 /17: The family in the early Keeping Up With The Kardashian seasons.

16/17 :The family in the early Keeping Up With The Kardashian seasons.

17 /17: Keeping Up With The Kardashians.

17/17 :Keeping Up With The Kardashians.