Kylie Jenner shows off her trademark style in skinny jeans and a simple vest as she steps out ahead of her milestone 18th birthday

She has a week to go until she rings in her milestone 18th birthday.

But Kylie Jenner didn't appear to be too excited about her upcoming celebrations as she stepped out near her home in Calabasas, California on Monday.

The teen star did, however, manage to look as stylish as ever with a typically effortless casual ensemble as she emerged with her close pal, singer Pia Mia.

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Simple and chic: Kylie Jenner exhibited her trademark casual but flattering style as she stepped out for a drink in Calabasas, California on Monday

Simple and chic: Kylie Jenner exhibited her trademark casual but flattering style as she stepped out for a drink in Calabasas, California on Monday

Looking slightly moody as she walked across a car park, the star showed off her trademark style, sporting a pair of skintight grey and cropped skinny jeans with Nike trainers in a similar shade.

She kept it clean-cut and fuss-free with a white vest top tucked into the high-waisted denim, while covering her face with a pair of oversized shades.

With her raven tresses appearing freshly washed, she flung her long locks over her head to add to her insouciance.

Pia Mia, meanwhile, stole the show in her own way, flaunting her slender legs in a pair of tiny denim shorts and showing them off further with calf-length towering black boots.

Show stealer: Kylie, 17, was joined by her close pal Pia Mia, who rocked a slightly more eye-catching look as they went to get some drinks after having dinner together

Show stealer: Kylie, 17, was joined by her close pal Pia Mia, who rocked a slightly more eye-catching look as they went to get some drinks after having dinner together

Work a shade of grey in Kylie's Nike Roshe Run trainers

She’s made her mark in terms of being a style icon on her Jenner-ation. And it doesn’t stop with the designer clothes and lips, because Kylie’s dressed down style has got heads turning too.

The trend-setting teen loves a good pair of trainers and gave her adidas Yeezy’s a break in favor of some similar style Nike Roshe Run trainers in a shade of grey. Her style isn’t black and white obviously, you know…

The super cool running trainers are the perfect sports luxe statement because they can run a mile or two yet still look fabulous with any outfit you pair them with. They’re the statement of this outfit for sure!

So make like Kylie and nab her exact trainers now with a click to the right from Zappos, you won't regret it and they'll go with any outfit from a black maxi dress to a pair of skinnies.

If you want to shop around first, head to the edit below where you'll find our favorite alternatives from Asos and EastBay.com.

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The blonde beauty - who later appeared in an Instagram snap on Kylie's page - also flashed her toned tum under a cropped t-shirt, and tied a pink shirt loosely around her slim hips.

Carrying a cold beverage in one hand after a refreshment run, Kylie was also notably still sporting a ring on the third finger of her left hand.

That very same small and seemingly innocent item of jewellery has set tongues wagging, recently, as it was initially believed the reality TV star was hinting that she had taken her relationship with rapper Tyga, 25, to the next level.

Not long to go now! Kylie appeared relaxed as she stepped out while still wearing a ring on the third finger of her left hand, just one week ahead of her milestone 18th birthday

Not long to go now! Kylie appeared relaxed as she stepped out while still wearing a ring on the third finger of her left hand, just one week ahead of her milestone 18th birthday

However, Kylie was forced to deny the allegations, later taking to her social media account to let her fans know she wasn't engaged.

'Not planning on getting married anytime soon :) (sic),' she wrote. 

Meanwhlie, Kylie is allegedly set to celebrate her milestone 18th birthday in Montreal, Canada, where she'll be of legal drinking age.

Although the limit may be 21 in America, the starlet is set to receive a fee of 'more than $100,000' to host a blowout bash on August 16, six days after her actual birthday.

Outfit change: Kylie later shared a snap of herself with singer Pia Mia, having changed into a torso-revealing crop top 

Outfit change: Kylie later shared a snap of herself with singer Pia Mia, having changed into a torso-revealing crop top 

According to TMZ, Kylie will celebrate her milestone birthday at the Beachclub Montreal, a mini party island decked out with a pool, A-list DJs, its own beach and alcohol on offer.

It's claimed the teen will be paid between $100k and $200k just for showing up to the event and partying with her friends.

It's believed the club's owner, Olivier Primeau, will have Kylie flown into the bash by helicopter, where she'll land on a luxury boat that will dock next to a table flooded in bottles of champagne.

She'll also blow out the candles on a $3,000 birthday cake and, according to the site, tickets for the event are retailing between $40 to $150.

Denial! Kylie was forced to take to Twitter to deny rumours that she was engaged to her rumoured boyfriend, rapper Tyga

Denial! Kylie was forced to take to Twitter to deny rumours that she was engaged to her rumoured boyfriend, rapper Tyga

However, she's perhaps keen to keep it more on the family and friends side of things for her big day.

Speaking to E! recently, Kylie revealed she was planning a huge party and a holiday with her friends to celebrate her 18th birthday.

She said: 'The first thing I want to do is maybe have like a birthday party and then maybe go on a trip with just my friends.

'I'm legal, so I can go on a trip legally without a chaperone, so that'll be fun, just a girl trip.' 

The pic that caused the rumours: Kylie had initially incited excitement when she posted a snap of herself on Instagram, sporting the supposed 'engagement ring'

The pic that caused the rumours: Kylie had initially incited excitement when she posted a snap of herself on Instagram, sporting the supposed 'engagement ring'

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