Royal style file: Princess Eugenie and Princess Beatrice's looks over the years

The world has watched as the two York sister have grown up into young women - and seen their style change with them.

Princess Beatrice and Princess Eugenie, as two of the youngest members of the royal family, have often attracted attention for their fashion choices throughout the decades.

They're well known for their eclectic and unusual style - and their fabulously outrageous hats.

It was the two sisters sparked a media frenzy at the Duke and Duchess of Cambridge's wedding in 2011, when they both wore two outlandish Philip Treacy designs.

Beatrice and Eugenie often sport a more demure style. As two young royals, they'd usually be spotted wearing the standard royal uniform of pretty tea dresses and buckled shoes. But it's special occasions where the sisters really come int their own.

As the sisters approached their teen years, they began to be a little more experimental with their choices, often wearing brightly coloured frocks and matching jewellery.

But in their 20s, the two Princesses appear to have found their fashion groove. Now, they mix up their looks on a regular basis, switching between subtle and demure options when working and at serious events - and being a little more daring with sleek but zany gowns - and of course, their signature hats.

So, as everyone waits with bated breath to find out what the York sisters will wear to Meghan and Harry's wedding this Saturday, we take a look back at Princess Beatrice and Princess Eugenie's fashion through the years...

Beatrice and Eugenie, 2017

At the annual Christmas Day service, the duo looked elegant and regal in stylish coats and simple hats - a departure from their usual, more dramatic style.

Beatrice and Eugenie, 2017

At an event in Miami, the York sisters looked as stylish as ever, with Beatrice in a flattering metallic skin

Beatrice and Eugenie, 2017

At a fashion event in London, the sisters put their best fashion foot forward in stylish florals. Eugenie favoured a dress by designers Erdem - whom she also wore when announcing her engagement...

Beatrice and Eugenie, 2017

By 2017, Eugenie and her sister had truly found their style groove, wearing cuts and fits that flattered their bodies - whilst staying true to their preferred style.

Beatrice and Eugenie, 2015

The Princess' truly upped the style stakes as they approached their late 20s, wowing in these sleek and sophisticated white numbers.

Beatrice and Eugenie, 2012

Never ones to shy away from colour, the girls kept it fun in these blue and purple silk gowns.

Beatrice and Eugenie, 2012

The sisters do dressed-up chic just as well as they do a more relaxed look - here, Eugenie and Beatrice look smart and sophisticated, but relaxed and royal all at the same time, whilst enjoying an event at the 2012 London Olympics.

Beatrice and Eugenie, 2011

Who could forget the Princess' looks for the royal wedding back in 2011? The sisters stunned the crowd with their outrageous hat choices - with many comparing Beatrice's to a lobster!

Beatrice and Eugenie, 2010

The sisters wowed in these bright dresses in their early 20s, at a charity event for elephants.

Beatrice and Eugenie, 2009

Donning brilliantly stylish and outlandish fascinators, the two sisters matched perfectly here on a day at the races.

Beatrice and Eugenie, 2009

The royal duo headed off on a night out in their early 20s dressed in dazzling bright, satin dresses.

Beatrice and Eugenie, 2004

Still finding their feet in the fashion world, the pair attended the polo in matching white jackets and floral dresses - a favourite for the sisters around this time.

Beatrice and Eugenie, 2000

Joined by 'Granny', as the sisters so often call her, Eugenie and Beatrice looked the epitome of royalty, in simple coats, scarves and hats.

Beatrice and Eugenie, 1998

The adorable sisters, at just 10 and 8 years old, looked a picture in matching dresses.