Kylie Jenner, 15, looks older than her years in revealing top and leather trousers at Justin Bieber concert

Kylie Jenner, 15, looks older than her years in revealing top and leather trousers as she indulges her teenage side at Justin Bieber concert

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UPDATED:

15:14 GMT, 3 October 2012

She's the youngest of the Kardashian clan, bar Kourtney's daughter Penelope, but Kylie Jenner does her best to keep up with her siblings when it comes to her outfit choices.

The 15-year-old reality star looked older than her years as she wore a revealing, side-less top and a pair of skintight red leather trousers on Tuesday night.

However, despite Kylie's sophisticated outfit, she was actually taking the opportunity to indulge her teenage side, as she popped to the Justin Bieber concert in Los Angeles.

Lady in red: Kylie Jenner looks older than her 15 years in tight leather trousers and stilettos at a Justin Bieber concert

Lady in red: Kylie Jenner looks older than her 15 years in tight leather trousers and stilettos at a Justin Bieber concert

Kylie finished off her outfit with a pair of black and perspex court shoes, and left her long brown hair loose and straight for the outing.

And Kylie's adult outfit was only emphasised by the fact that the concert was filled to the rafters
with teenage fans out to see Justin Bieber.

The concert held at LA's Staples Centre was part of Justin's Believe tour with Carly Rae Jepson and Cody Simpson opening the show.

Will you sign my ball The young reality star is confronted by fans hoping for an autograph

Will you sign my ball The young reality star is confronted by fans hoping for an autograph

Spot the difference: Kylie looks far older than the teenager asking for an autograph

Spot the difference: Kylie looks far older than the teenager asking for an autograph

The pretty teen was joined by her mother
Kris Jenner, who wore a grey leather jacket and sunglasses to the
packed out event.

Even 43-year-old TV personality Kyle Richards wore a far more demure outfit that wouldn't be out of place on a girl Kylie's age.

The Real Housewives Of Beverley Hills star kept it simple in a white vest and blazer with black jeans and red trainer boots.

Mother's approval: Kris Jenner accompanied her youngest daughter to the concert at the Staples Centre

Mother's approval: Kris Jenner accompanied her youngest daughter to the concert at the Staples Centre

Young at heart: Real Housewives of Beverley Hills star Kyle Richards takes her son to the Justin Bieber concert at the Staples Centre on Tuesday night

Young at heart: Real Housewives of Beverley Hills star Kyle Richards takes her son to the Justin Bieber concert at the Staples Centre on Tuesday night

Kylie's older sister Kendall, 16, has
also come under fire for dressing far too old for her age in the past, but with their half-sisters Kourtney, 33, Kim and Khloe, 28, all reaping the benefits of their celebrity status by
getting free clothes and invited to showbiz events, it's no surprise the
Jenner girls want to join in on the fun.

But as the duo continue
to appear in scantily clad outfits it's clear that their mother, Kris
Jenner, doesn't have a problem with it.

According to OK! magazine, Kris – who conceived Kylie and Kendall with second husband Bruce – not
only allows her youngest daughter to dress sexily, but one insider says
she 'encourages it.'

Revealing: Kylie shows off a lacy bra underneath a loose fitting vest, begging the question, is this outfit appropriate for a 15-year old
Revealing: Kylie shows off a lacy bra underneath a loose fitting vest, begging the question, is this outfit appropriate for a 15-year old

Dark Angel: Justin Bieber descends from the heavens to the sound of his screaming fans at his concert in the Staples Centre

Dark Angel: Justin Bieber descends from the heavens to the sound of his screaming fans at his concert in the Staples Centre

Musician Carly Rae Jepsen performs during the Believe Tour at Staples Center

Justin Bieber opens his 2 night stand of his Believe World Tour at Staples Center in Los Angeles. Carly Rae Jepsen and Cody Simpson both opened for him. Backstage Selena Gomez was seen riding around on a Segway.

Supporting Acts: Pop sensations Carly Rae Jepson and Cody Simpson opened for Justin Bieber in his Believe tour

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