KIM Kardashian is celebrating her 40th birthday today - and if you ask us, she looks as good now as she did when Keeping Up with the Kardashians debuted in 2007.

Over the past 13 years, Kim has established herself as a savvy businesswoman (estimated to be worth 670m) and is now a proud mum-of-four.

But while there's no denying the Kardashians have influenced our fashion choices over the years , we also have Kim to thank for our full-blown obsession with contouring.

Here Fabulous Digital takes a look back at Kim's changing face as the social media icon turns 40.

If old episodes of Keeping Up with the Kardashians are anything to go by, Kim might just feel brave enough to give Botox another go now she's 40 years old.

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In season five of the hit series, Kim - who was 30 at the time - took sister Khlo along for moral support as she tried Botox for the first time.

Ahead of the appointment, Kim said: "I'm going to try Botox to get rid of my wrinkles and once and for all I'm going to see what it's all about."

The star visited Lift MD Aesthetics in Beverly Hills where she had Botox injected near her temples.

In the days that followed, Kim says the area where she'd been injected was swollen, sore and itchy - which prompted her to swear off Botox for another ten years.

While out for lunch with Khlo, Kim asked for a glass of ice and said her eyes felt like they were "on fire".

Although Kim feared she'd had an allergic reaction to the Botox, her family doctor Dr Vaisman confirmed that bruising was a normal yet uncomfortable side effect of the procedure.

After the swelling eventually went down, Kim said: "I'll never do this again... at least, not until I'm 40."

Over the past 13 years, Kim has proved she isn't afraid to experiment with her hair - changing from luscious long locks to cropped blonde bobs in a heartbeat.

But in 2015, the star admitted that she'd had laser hair removal on her forehead to get a more defined hair line.

She told People magazine: "I have the hairiestforehead you could ever imagine, and I would always break out.

"In high school, I would wax it off because there was just so much hair."

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A year later, Kim admitted in a blog post on her website that she regretted having the permanent laser treatment.

She wrote: "Every photographer would Photoshop them out anyway, and I thought I looked better without the baby hairs, but now I miss them."

If there's one thing we know about Kim Kardashian - it's that she's doesn't shy away from experimental beauty treatments... no matter how uncomfortable they may be.

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In 2013, the star hit headlines when she tried out the experimental "vampire facial" while filming Kourtney & Kim Take Miami.

The actual name for a vampire facial is Platelet Rich Plasma (PRP) Therapy which uses nothing but the patient's own blood to plump the skin.

Platelets are tiny blood cells which play a crucial part in helping the body stop bleeding - as well as repairing damaged blood vessels and cells.

In PRP, a needle is used to draw blood from the client's arm. The blood is then spun in a machine, to remove the platelets.

Although patients are offered local anaesthetic cream before the injections, Kim told W magazine in 2018that she'd refused painkillers because she'd just found out she was pregnant with North.

She said: "Before I got the procedure, I just found out that I was pregnant, so I couldnt use numbing cream or a pain killer and both are suggested.

"It was really rough and painful for me."

Last year, Kim tried out the the Exilis Laser 360 facial which uses radio frequency and an ultrasound technology laser to tighten skin.

The treatment also stimulates collagen production which makes the skin look plumper.

Reality star, social media icon, mum-of-four, multimillionaire - there are a lot of things you can call Kim Kardashian... but "Queen of Contour" is our personal favourite.

Although Hollywood starlets had used contouring to highlight their cheekbones, Kim brought it to the mainstream in 2012 when she shared a photo of her lengthy make-up routine.

Makeup artist Scott Barnes started by using a generous amount of light concealer under Kim's eyes along her nose.

He then went in with a cream bronzer underneath Kim's cheekbones to create a natural-looking shadow.

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And just like that, Kim kickstarted a beauty craze which meant we could all fake the perfect bone structure.

The star has since gone on to launch her own contouring products as part of her KKW line.

However, in 2016 Kim said she was "over contouring".

Speaking on a panel with Charlotte Tilbury, she said: "I think right now it's more about nontouring, like real skin with less make-up on it.

"I'm trying to wear less... and my husband loves me without make-up."

It's safe to say that beauty trends have come a LONG way since Kim first rose to fame 13 years ago.

In the noughties, brows were thin and defined and it was all about the smokey eye.

She previously told TODAY: "In the 90s, in high school, I would make my brows so thin!"

According to Cult Beauty, the star loves Anastasia Beverly Hills' 15 brow pomade so much that she even used it on her wedding day to Kanye.

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Kim reportedly maintains her brows with professional waxing and trimming appointments too.

And just because she has access to the world's top make-up artists, that doesn't stop Kim from using a beauty bargain from time-to-time.

In a YouTube beauty tutorial, Kim's make-up artist Mario Dedivanovic raved about Ardell's 5 false lashes.

Explaining how he combines different lengths to create a fluttery effect on the star, he said: "I like to useArdell DuraLash Naturalsin Medium and Long." *Adds to basket*

For more celebrity stories, these reality stars are morphing into each other as Kady McDermott goes full Maura & Vicky Pattison gets a Towie clone.

And Gemma Atkinson opened up to Fabulous magazine about mum life, taking on haters & keeping things hot with Gorka.

Plus Meghan wore 300k worth of jewellery and clothes in new pic to promote show on building a better digital world.

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Kim Kardashians changing face as she hits 40 and why shes probably about to reach for the Botox - The Sun