The Queen shared a heartfelt message to celebrate her daughter Princess Anne's 72nd birthday on Monday.
MORE: Princess Anne's two bold engagement rings broke royal mould
A beautiful picture was shared on the royal family's Twitter account, showing the hardworking royal at the Not Forgotten Association Garden Party at Buckingham Palace back in May.
WATCH: Princess Anne celebrates her 72nd birthday
The caption read: "Wishing The Princess Royal a happy birthday today!" Prince William and Kate also paid tribute, tweeting: "Wishing a very happy birthday to The Princess Royal today!"
MORE: Princess Anne's undeniably close bond with her mother the Queen in 11 photos
SEE: 9 pictures which prove Princess Anne had the closest bond with her late father Prince Philip
The celebration comes one month after the mother-and-daughter duo carried out a rare joint engagement in Maidenhead. They travelled there to officially open the new Thames Hospice building.
The royals were given a warm welcome at the hospice, which provides palliative and end-of-life care to people aged 16 years and over across East Berkshire and South Buckinghamshire.
The royal family's Twitter account shared this photo of Princess Anne
Princess Anne has an undeniably close bond with her 96-year-old mother and the pair share a love of sport, horse riding and equestrian events in particular.
The Princess Royal has also followed in the Queen's footsteps with her work ethic and has regularly topped the hardest-working royal tally with hundreds of engagements carried out each year.
It's not known whether Anne – who was crowned the hardest working royal in 2021, notching up 387 public appearances - has joined the Queen at her Balmoral estate yet this summer.
The Queen with her daughter last month
The royal shares two children, Peter Phillips and Zara Tindall, with her first husband, Captain Mark Phillips. She went on to marry Vice Admiral Sir Timothy Laurence at Crathie Kirk near Balmoral Castle on 12 December 1992.
She is also grandmother to Zara and Mike's children, Mia, eight, Lena, four, and one-year-old Lucas, as well as Peter and his former wife Autumn's children, Savannah, 11, and Isla, ten.
Make sure you never miss a ROYAL story! Sign up to our newsletter to get all of our celebrity and royal news delivered directly to your inbox.