Turning 40 is a milestone.

In doing so, their nine-year-old son, Prince George,became second-in-line to the throne.

Who knows what her 41st year might hold?

Britain’s Catherine Princess of Wales leaves at the end of the Royal Family’s traditional Christmas Day service at St…

Britain’s Catherine, Princess of Wales leaves at the end of the Royal Family’s traditional Christmas Day service at St Mary Magdalene Church in Sandringham, Norfolk, eastern England, on December 25, 2022. (Photo by Daniel LEAL / AFP) (Photo by DANIEL LEAL/AFP via Getty Images)

It was the first state visit hosted by the UK with King Charles III as monarch.

She used the trip to champion her work in early childhood development.

This post was originally published inTatler.

The Princess of Wales is elegant in green for the Christmas Day church service at Sandringham.

The Princess of Wales welcomes her husband and children Prince George and Princess Charlotte to the Together at…

In her second tiara engagement in under a month the Princess of Wales welcomes guests to a Diplomatic Corps reception at…

The Prince and Princess of Wales attend the Earthshot Prize 2022 at MGM Music Hall the culmination of their royal visit…

The Princess of Wales and President Cyril Ramaphosa of South Africa share a toast during the State Banquet at Buckingham…

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The Queen Consort and the Prince and Princess of Wales attend the Ceremonial Welcome at Horse Guards Parade for…

The Prince and Princess of Wales attend the annual Festival of Remembrance at Royal Albert Hall.

The Princess of Wales makes a cocktail as she visits the Trademarket outdoor market as part of a royal visit to Northern…

In her first visit to Wales as the Princess of Wales Catherine receives a posy of flowers from Charlotte Bunting age two…

The Princess of Wales joins members of the Royal Family at the state funeral of Queen Elizabeth II at Westminster Abbey.

Following the death of the queen the new Prince and Princess of Wales were accompanied by the Duke and Duchess of Sussex…

Prince George Princess Charlotte and Prince Louis accompanied by their parents arrive for a settlingin afternoon at…

The then Duke and Duchess of Cambridge brought their daughter Princess Charlotte to watch the Commonwealth Games in August.

Looking cool in sunglasses Kate joined her husband William and son Prince George at Wimbledon.

A sweet moment between Her Royal Highness and her youngest son Prince Louis at the Queens Platinum Jubilee extravaganza.

The Duke and Duchess of Cambridge were joined by their children Prince George and Princess Charlotte on a visit to…

Left to right the Duchess of Cornwall Prince Charles Queen Elizabeth II Prince Louis the Duchess of Cambridge Princess…

It was a Hollywood moment as Kate joined Tom Cruise at the royal premiere for Top Gun Maverick in Leicester Square.

Catherine turned heads in coral as she joined William to represent the queen at one of the Buckingham Palace Garden Parties.

The Duchess of Cambridge and Princess Anne visited the headquarters of the Royal College of Midwives and the Royal…

Her Royal Highness left hand in hand with her daughter Princess Charlotte following the Easter Sunday service at Sts…

The Duke and Duchess of Cambridge were joined by their children Prince George and Princess Charlotte at the memorial…

The Duchess of Cambridge was pretty in pink on a visit to Great Abaco Bahamas as part of her and Prince Williams royal…

The Duchess of Cambridge put on a showstopping display in royal blue at the Commonwealth Day Service at Westminster Abbey.

The Duchess of Cambridge made a solo visit to Denmark where she was hosted by Crown Princess Mary pictured. She used the…

Fresh from celebrating her 40th birthday the Duchess of Cambridge looked chic in a caramel ensemble on a visit to…