Image: Rex

It's official: Kylie Jenner is the most influential Kardashian.

At just 17, Kylie has surpassed her siblings to become the favourite sister among teenagers, according to a survey by Polyvore.

With over 12 million Instagram followers and seven million Twitter fans, the young reality star has been steadily building a massive fan base.

Mum Kris Jenner reckons it’s Kylie’s unique style that is key to her appeal: ‘I realised two to three years ago, my older daughters were asking Kylie for fashion advice. Kylie decided she had this edgy style… she wasn’t satisfied going along with what Kendall wanted.'

Both Kylie and Kendall appeared on Time Magazine’s 25 Most Influential Teens of 2014, released on Monday.

Last week, Kylie announced her new hair extensions line, and has already won advertising contracts with the likes of O.P.I and Californian lifestyle brand PacSun.