Kendall Jenner used to have terrible acne.

The 19-year-old reality TV star is currently one of the most in-demand models in the world but her younger sister Kylie, 17, revealed that Kendall suffered with bad skin when she was younger.

Kylie told the New York Times: ''We have a family dermatologist, Christie Kidd in Beverly Hills. My sister Kendall had really bad acne when she was younger, and she really cleared it up. I thought, 'Well if she cured Kendall, I should start to visit her.'''

Kylie also revealed that she picked up some beauty tips from her older sister Khloe Kardashian, 31, who taught her to wear sunscreen every day.

She said: ''My sister Khloe taught me to wear sunscreen. I use one by TiZO3. It doesn't really smell like sunscreen, which I like, and it's tinted. If I wake up in the morning and have to run somewhere, I'll just put that on solo.

''I have sensitive skin and it's super dry, so a lot of stuff irritates me. For eye cream, I love the Kiehl's avocado eye treatment.''