Jenner, who turned 17 last week, shared the news on the 2014 Teen Choice Awards red carpet, reported E!Online.
"I shaved the back of my head for my birthday. I was just doing my hair and I was like: 'Why not shave the back of my head?'," she said.
Jenner is not the first sister in the famous family to try the shaved look. Kim Kardashian, who joined her siblings at the awards show, shared that she'd rocked the style over two decade ago.
"I did that haircut when I was 12 years old. The cool thing is to do the back of your head and then wear a ponytail. I might do it. I should.