The Duchess of Cambridge has received birthday wishes from around the globe as she celebrates her 37th birthday.
Royal households, British embassies and charities of which Kate is patron are among those who posted their congratulations.
Kensington Palace thanked the public for their "lovely messages".
The duchess is expected to be marking the occasion on Wednesday with husband the Duke of Cambridge and their three children Prince George, Princess Charlotte and Prince Louis.
William has an official engagement in the day, meeting pilots and paramedics from London's Air Ambulance.
Kate has had a busy 12 months on the family front, giving birth to Prince Louis last April and becoming a mother of three.
Over the coming year, the Cambridges' middle child Charlotte is set to turn four in May and then start school in September, when she will most likely join George at private school Thomas's Battersea.
George will be celebrating his sixth birthday in July, while baby Louis turns one on April 23.
Kate has also become an aunt to sister Pippa Matthews's baby son Arthur, and the Cambridges are also awaiting the arrival of the Duke and Duchess of Sussex's first child in the spring – another cousin for George, Charlotte and Louis.
Catherine Elizabeth Middleton was born to Carole and Michael Middleton at the Royal Berkshire Hospital in Reading on January 9 1982.
She was christened at the parish church of St Andrew's Bradfield in Berkshire on June 20 1982.
Amman in Jordan was home to Kate and her family for a few years in the mid-1980s, where she attended a nursery school from the age of three, before returning to Berkshire.
At the age of 13, she went to the exclusive, private Marlborough College in Wiltshire, where she part-boarded.
During her time there, she represented the college at tennis, hockey and netball.
She graduated in 2005 with a 2:1 in History of Art from St Andrews University, where she met and began dating William, whom she married in 2011.
Kate – now an HRH and a future queen – is patron of 17 charities and organisations, and has focused her charity work on helping children have the best possible start in life, particularly surrounding their mental health.