Kylie Jenner celebrated turning 24 on Tuesday, with the billionaire makeup mogul taking to Instagram to show off her voluptuous figure in a slinky green dress, as well as her famous pout.

‘Cheers to 24,’ the entrepreneur captioned the series of photos, where she looked barely recognizable to how she first appeared as a young star on Keeping Up with the Kardashians.

While many fans rushed to wish Kylie happy returns, some marveled at just how different the star looks with one Instagram user simply commenting: ‘You have changed so much.’

My how you’ve changed! Kylie Jenner celebrated turning 24 on Tuesday with a series of sultry snaps on Instagram wearing a slinky green dress (right, pictured in 2011)

Sister Kim Kardashian also posted a series of throwback snaps on Tuesday to celebrate Kylie’s big day.

‘Happy Birthday Ky!!!’ Kim wrote. ‘I love you so much! You will always be my 𝑏𝑎𝑏𝑦 sis and I’m here for you no matter what!’

In them, the youngster looks a million miles away from the glamorous figure that is shown to 256million followers on Instagram.

Kylie has consistently shocked fans with her changing appearance, and has admitted to having had fillers put in her lips when she was just 15 years old, saying at the time: ‘It’s just an insecurity of mine and it’s what I wanted to do.’

Green with envy? The young star showed off her voluptuous figure for her 𝐛𝐢𝐫𝐭𝐡day, which looks noticeably different from how she appeared in 2014 (right)

Changing shape: Viewers of KUWTK have been astounded at how the reality star’s appearance has changed over the years

Slinky: Kylie showed off her figure in a tight-fitting green dress for the special occasion, and looked remarkably different from how she has appeared previously (right, pictured in 2014)

The young star went on to build a billion dollar business on her pout, which she dramatically enhanced over the years with fillers and over-lining lip liner.

The billionaire first appeared on screens as a fresh-faced 10-year-old and KUWTK viewers have long suggested her visage has altered dramatically over the years.

Amid media speculation Kylie originally denied getting injections, crediting carefully applied lip liner for accentuating her pout.

Like a whole new person: Kylie has been open about the fact she has used fillers and makeup trickery to change her looks – pictured left this week, and right in 2011

Celebrations: Kylie tied her 𝐛𝐢𝐫𝐭𝐡day to a special 24K collection of her Kylie Cosmetic range in this gold-themed shoot

Come May 2015, however, the reality star came clean and admitted to getting fillers.

In 2017 during an episode of Life of Kylie, the mother-of-one opened up about her decision to get the procedure, noting: ‘I was 15 and I was insecure about my lips … I [had] really small lips,’

‘It was like one of my first kisses and a guy was like, ‘I didn’t think you would be a good kisser because you have such small lips,” she said, adding that she ‘took that really hard’.

She continued, ‘Just when a guy you like says that, I don’t know, it just really affected me – I just didn’t feel desirable or pretty.’

From the vault: Kim Kardashian shared previously unseen snaps of her and Kylie to mark the occasion

Shocked face! Kylie looked unrecognizable in the snap shared by her sister Kim

Throwbacks: Sister Kim posted a series of throwback snaps on Tuesday to celebrate Kylie’s big day

Snaps: Kylie has often set tongues wagging with her ever-changing appearance

However, despite admitting to lip filler, she has categorically denied she has had plastic surgery on Twitter.

The reality star wrote: ‘These plastic surgery rumours hurt my feelings to be honest and are kinda insulting.’

A plastic surgeon previously told MailOnline that he believes Kylie’s face is the work of plastic surgery, in particular her ‘thin nose’ which he believed has been altered.

Alex Karidis, from the Karidis Clinic claimed her changed nose could be down to rhinoplasty, and said: ‘Her nose appears thinner, particularly at the tip.’

Keeping up with Kylie! Kylie Jenner’s fans couldn’t help but comment on her changing appearance after she appeared on the trailer for the final season of KUWTK earlier this year (pictured left in 2010 and right recently)

Life through a lens: The billionaire first appeared on screens as a fresh-faced 10-year-old and viewers have long suggested her visage has altered dramatically over the years (pictured)

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No knife here! The make-up mogul has always denied going under the knife to achieve her sculpted visage and instead credited fillers and make-up trickery (pictured left 2011 and right 2020)

However, Kylie has always denied undergoing any other surgery on her face despite constant rumours surrounding the shape of her eyes, cheekbones and chin.

In 2015 the Keeping Up With The Kardashians star addressed the ongoing speculation on her website.

She wrote on her website: ‘No, people – I haven’t gotten breast implants. Everyone is obsessed with that. Truth is, as I’ve gotten older, I’ve gained 15 pounds and my body has changed; I’ve definitely filled out.

‘I just use the Bombshell by Victoria’s Secret. It’s life-changing. I’ve gotten all my sisters on it and all my friends…Clearly, it’s like 10 times bigger – no contouring, no nothing.

Dramatic look: The young star has gone on to build a billion dollar business on her pout, which she dramatically enhanced over the years with fillers and over-lining lip liner

Changing things up: Amid media speculation Kylie originally denied getting injections, crediting carefully applied lip liner for accentuating her pout

‘This is all padding. I think it makes your breast look great and girlie. This is it. No breast implants. No surgery. Nothing. It’s amazing. So if you guys want this look, here’s my secret.’

She added: ‘Working with some of the best makeup artists has taught me a lot of amazing tricks to making me feel more confident and I can’t wait to share them with you guys.

‘I swear there are things you can do to work on problem areas without having to think about plastic surgery. (Contouring has changed my life!)’.

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Speculation: Top plastic surgeon Mark Ho-Asjoe also previously told Closer magazine that he believes she has had more work done than she claims and this is ‘ageing her’ (pictured in 2017, left, and 2014, right)

Child star: As the youngest of the Kardashian/Jenner clan, Kylie grew up in the spotlight (pictured left in 2012 and right in 2019)