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Flawless! Kate Middleton's Best Looks Over The Years — See Photos Of Her Glitzy & Colorful Outfits

Kate Middleton is always dressed to the nines! See photos of her style evolution over the years.

Over the years, Kate Middleton has become a fashion icon — not only does she always manage to look amazing, but she also tries to recycle previous outfits.

On Sunday, January 9, the mom-of-three will celebrate her 40th birthday, and though the COVID-19 cases are up around the world, it seems like Prince William and their tots, Prince George, 8, Princess Charlotte, 6, and Prince Louis, 3, will do everything to make it as special as possible.

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"It will be low key and it will be focused entirely on the family," expert Duncan Larcombe told OK!. “She’s unlikely to [announce a new project on her birthday, unlike Meghan Markle who launched a mentorship program to mark her 40th] because, firstly, it’s just not her way and secondly because of the obvious comparisons with Meghan and this awful continuation of one-upmanship that the palace is so keen to avoid.”

Scroll through the gallery below to see Kate's best looks!

Red hot! The brunette beauty arrived to the Queen's Diamond Jubilee River Pageant Flotilla wearing a bright frock, which she paired with nude heels.

Kate sported a plaid dress as she posed alongside her hubby at the Horse Guards Parade in 2014.

When William and Kate arrived in Vancouver in 2016, she made a statement with her red patterned dress and fun heels!

Is red Kate's color? While at the Queen's Diplomatic Reception at Buckingham Palace in 2016, she wore a tiara.

The Duchess, who wore a white patterned dress and nude shoes, looked like she enjoyed her visit to the Commonwealth War Graves Commission's Bedford House Cemetery.

Smile! Kate clutched onto a neutral purse while out and about in Sweden in 2018.

Even while pregnant, Kate still looked amazing in a long, green gown when she was photographed at the British Academy Film Awards in 2018.

So sleek! Kate pulled off green pants and a maroon top in London.

Kate made waves when she showed off her lace dress at the Royal Variety Performance in November 2019.

At the BAFTA Film Awards 2020, Kate rocked a gold and white dress.

In May 2021, Kate looked picture perfect in a red and black dress as she walked around an exhibit.

Glitz and glamour! Kate's gold dress made headlines at the No Time to Die premiere — especially because she emulated William's late mother, Princess Diana.

Kate looked angelic in a purple dress at the Earthshot Prize Awards Ceremony, which took place in October 2021.

Kate and her green dress made a statement at the Royal Variety Performance in November 2021.