Kate Middleton wore a 780 emerald green sequin dress from

Kate Middleton wore a £780 emerald green sequin dress from Needle & Thread for King Charles’ 75th birthday party

Kate Middleton oozed glamor in a festive emerald green sequin dress for King Charles’ glittering 75th birthday party.

The 41-year-old Princess of Wales was spotted leaving Clarence House with her husband, the Prince of Wales, just before midnight last night.

The royal looked elegant in an emerald green sequined recycled polyester dress from Needle & Thread Alicia.

The stunning floor-length ensemble, which retails at £780, features long sleeves and a stand-up collar.

The Princess also owns the stunning red dress she wore to an investment summit at Buckingham Palace in 2020.

Kate Middleton oozed glamor in an emerald green sequin dress for King Charles' glittering 75th birthday party

Kate Middleton oozed glamor in an emerald green sequin dress for King Charles’ glittering 75th birthday party

The mother-of-three styled her long brunette locks into a straight middle part, while her glamorous make-up accentuated her flawless complexion.

In the festive mood, Kate seemed to add even more sparkle with diamond earrings.

While Prince William, also 41, looked dapper in a white shirt and jacket as he drove from the royal’s London residence.

The king’s birthday celebration was attended by his niece Princess Beatrice, Princess Margaret’s daughter Lady Sarah Chatto and the monarch’s niece Zara Tindall and her husband Mike.

Looking effortlessly elegant, Zara, 42, stunned in Australian designer Rebecca Vallance’s £640 Eva dress, which featured a figure-skimming silhouette and dazzling beaded detailing.

Charles celebrated his 75th birthday with a gun salute and sing-along at a food waste project, followed by a reception for the NHS on Tuesday.

A royal 41-gun salute at Green Park in central London, a 62-gun salute at the Tower of London and a 21-gun salute in Edinburgh marked Charles’ milestone on Tuesday.

The 41-year-old Princess of Wales was spotted leaving Clarence House with her husband, the Prince of Wales, just before midnight last night

The 41-year-old Princess of Wales was spotted leaving Clarence House with her husband, the Prince of Wales, just before midnight last night

The Aurelia long sleeve dress in emerald green is last season's dress and is therefore currently on sale for £490

The Aurelia long sleeve dress in emerald green is last season’s dress and is therefore currently on sale for £490

The royal looked elegant in an emerald green sequined recycled polyester dress from Needle & Thread Alicia

The royal looked elegant in an emerald green sequined recycled polyester dress from Needle & Thread Alicia

The mother-of-three styled her long brunette locks into a straight middle part, while her glamorous make-up accentuated her flawless complexion

The mother-of-three styled her long brunette locks into a straight middle part, while her glamorous make-up accentuated her flawless complexion

This happened when Kate released a slick video to promote her keynote speech at the Shaping Us symposium taking place today.

Kate, 41, who will be speaking at the event at the Design Museum in London, is seen gliding towards the stage door as her Gianvito Rossi dramatically hits the floor.

“Tomorrow we are hosting the #ShapingUs National Symposium,” last night’s video caption read.

“We will bring together interdisciplinary leaders, child and adult specialists, and global thinkers for the first time to consider how we grow, think and behave throughout life to build resilience for the future.”

Last night, Kate was also photographed at a reception for the symposium, where she had the opportunity to prepare for her keynote speech.

Snaps from yesterday show the princess rehearsing at the podium as she prepares for the big day.

The Princess also owns the stunning red dress she wore to an investment summit at Buckingham Palace in 2020

The Princess also owns the stunning red dress she wore to an investment summit at Buckingham Palace in 2020

She also grinned as she chatted to guests yesterday, including Justin Welby, the Archbishop of Canterbury.

In addition to lectures by the Princess of Wales, the symposium also features lectures by Professor Jack Shonkoff, director of the Center on the Developing Child at Harvard; Sara Rajeswaran, Chief of Staff at Aviva and Professor Robert Waldinger, Director of the Harvard Study of Adult Development.

Fearne Cotton will also host the event.

In the afternoon, participants will also take part in a series of workshops exploring what actions can be taken at all levels to protect and strengthen the skills of current and future generations across disciplines and sectors.

The multimedia campaign is part of a major initiative by the Royal Foundation Center for Early Childhood, launched by the Princess in June 2021, to raise awareness of how our early years shape our lives.

It is scheduled to run for at least five years and has been described in the past by a spokesman for Kensington Palace as the Princess’s “life’s work”.