Anything you can do! Kylie Jenner shares eye-popping bikini selfie just hours after sister Kim Kardashian unveils weight-loss in sexy swimsuit snap

They've consistently laughed off reports of rivalry in the past. 

But Kylie Jenner did nothing to dispel the myth that she's in competition with her older lookalike sister, when she posted an eye popping black and white bikini photo on Thursday.

The 18-year-old's racy mirror selfie followed just hours after Kanye West's wife broke the internet again in the tiniest one piece she's ever worn.

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Anything you can do: Kylie Jenner showcased her sizzling bikini body in a sexy black and white mirror selfie shortly after her elder sister Kim unveiled her incredible figure in a daring plunging swimsuit  

Taking the plunge: Kim Kardashian took to her Instagram just hours earlier to document her incredible post-baby body after welcoming second child, son Saint West, into the world in December 2015

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Kylie's behind-the-scenes photoshoot snap was accompanied by the caption: 'Fun now I can share more photos'.

Meanwhile, mum-of-two Kim's post simply said: 'Pre photo shoot fittings' while she hid her face with the camera phone to expose her ample chest and hourglass curves.

The sisters' stance mirrored each other's perfectly, making it seem like too much of a coincidence, considering the time between posts.

But Kim has been quick to deny the sibling rivarly in the past, saying in April via her own website: 'It's so funny. 

Kylie and I laugh so hard at this all the time, because people always want to pit us against each other, thinking we have similar careers. 

'I think it's amazing – there's no one else I would want to be in the same business with than my sister. She teaches me so much, and I teach her so much, and we're both so close that it's just funny,' 

Sister, sister: Curvy lookalikes Kylie (left) and Kim (right) have consistently been forced to deny reports that there is sibling rivalry

Stunning star: With her long raven locks and full lips, she certainly resembles her sister

In her Jenner-etics: It looks like Kylie's inherited the same features as her mum Kris and sister Kim

Kim and Kylie share mother Kris Jenner, the momager of the Keeping Up With The Kardashians dynasty.

Though like Rob, Kourtney and Khloe Kardashian, Kim's father was the late Robert Kardashian, while Kylie and big sister Kendall were from Kris' marriage to the athlete formerly known as Bruce Jenner, Caitlyn. 

Meanwhile, over on her personal app, Kylie previously insisted: 'People always put me and Kim in a competition, Or [say] I'm trying to be Kim or I'm trying to steal Kim's throne.' 

'I think people forget that me and Kim are sisters. We're not in a competition. We're completely different people.'

'She's one of my biggest inspirations. That's not a secret, I look up to my sister. I don't think that's a weird thing. We have a lot of love for each other.'

The teenager and budding businesswoman is certainly growing up fast, telling her loyal Snapchat following earlier that day that she had discovered her first grey hair.

The reality star shared her shock on Snapchat as she begged her hairdresser to pluck out the offending strand.  

Hair emergency: Kylie shared a Snapchat video on Thursday as she discovered her first grey hair

'Take it out!' The 18-year-old begged her hairdresser to pluck out the grey strand

'Oh my God, take it out!' the KUWTK star says with a laugh in the clip, which she captioned 'A grey hair.'

'Look what I found,' her hairdresser says, showing off the single grey.

Her friends then bicker over whether or not plucking out the hair will just make more greys sprout in its place.

'It you take it, she'll get more,' Kylie's worried friends says, before her stylist dismisses that as 'an old wives tale.'

In another Snap, Kylie then shows off her single grey hair after finally getting it plucked from her scalp.  

'You guys, my first grey hair,' says Kylie. 

Offending hair: The KUWTK star then blamed momager Kris Jenner, who she said also went grey in her twenties

And she adds that Kris Jenner's genes are to blame, saying: 'I think my mom got grey hairs in her early twenties.'

She may be right, as last month her sister Kendall Jenner also discovered she may be going grey.

The 20-year-old supermodel also shared her horror on Snapchat after she found a grey hair while getting a scalp massage.

But she tried to stay positive, joking that the light hair was actually blonde. 

'Just pulled this hair out of my head and cant tell if it's grey or blonde. It's blonde, right?' she asked.

Freak out: Kylie's sister Kendall Jenner also shared her Snapchat dismay as she discovered her first grey hair last month

Out it goes: The 20-year-old supermodel also quickly got rid of her grey hair

Kylie also showed off some new lip gloss colors for her Kylie Lip Kit line on Snapchat on Thursday.

Her new line comes after she issued a statement on Wednesday apologizing to fans after complaints about her cosmetics line earned her company a 'F' grade on ratings site Better Business Bureau. That was later changed to a 'Not Rated.' 

'You guys are the reason I keep going and I'm motivated every day to make Kylie Cosmetics the best it can be,' she wrote in an Instagram statement.

'I'm continuing to learn and I just want to make everyone happy. Because so many of you spoke out, I'm excited to tell you that the Better Business Bureau has looked at the facts and changed the rating.

Growing business: Kylie also showed off some new glosses she has planned for her Kylie Lip Kit line, which has been hit by complaints over shipping

'Listening:' Kylie defended her business and said the F rating on BBB had been changed, adding she was 'sick and tired of people coming for my business'

'I've sold millions of lip kits and any complaint we've received to date has been addressed in a timely manner,' she said. 

'I'm sick and tired of people coming for my business. I love everything about Kylie Cosmetics and I will do anything in my power to protect and improve it every day and make you guys happy.

'I don't want to respond to the haters but you guys deserve an answer and to know the facts. I love you and apologize to anyone who felt the urge to complain and didn't receive the service they deserve.'

Stylish: Kylie mixed up her hair color with a purple rainbow wig at an event in Thermal, California in April