Princess Anne showed off a quirky face mask when she visited St John Ambulance HQ in Lincoln on Monday, before officially opening a new joint ambulance, fire & police station on Southpark.
DISCOVER: Princess Anne reunites with former boyfriend at Royal Ascot
The 70-year-old royal looked elegant in a smart tweed blazer layered over a simple black dress, adding a pair of chic black gloves to complete the look.
But it was her special mask that caught royal fans' eyes, opting for a vibrant charity face covering that showed her support for the Injured Jockeys Fund.
WATCH: Princess Anne puts on a stylish display at Royal Ascot
The unisex mask, which costs £10, is a charity initiative to help jockeys past or present who are injured, unable to ride, or generally in need.
READ MORE: Princess Anne wears sparkling, sentimental jewel for radiant Ascot appearance
RELATED: Royals who married more than once: From Meghan Markle to Princess Anne
Keen equestrian Anne, who is Patron of the charity, first debuted the face covering at Royal Ascot, wearing it for all three days she attended the races. Our favourite look has to be when she teamed it with a lemon yellow suit and a feather embellished hat.
The Princess Royal's latest royal engagement on Monday saw her tour the £21 million facility (an ambulance, fire and police station all in one), which has been open since late 2019.
Princess Anne visited Lincoln on Monday
She met with staff as well as local councillors, before enjoying lunch at the County Emergency Centre, according to The Lincolnite.
The royal family has close ties to St John Ambulance; The Queen is Patron, while Anne is the Commandant-in-Chief (Youth) and several other senior members also hold titles.
Princess Anne also wore her new favourite accessory at Royal Ascot
Princess Anne has had a very busy few weeks, putting in several stylish appearances at Royal Ascot, where she joined the likes of the Countess of Wessex and Zara Tindall.
On Saturday, she joined her husband, Vice Admiral Sir Timothy Laurence, for a rare joint outing to mark Armed Forces Day celebrations at the National Memorial Arboretum.
The Princess Royal showed her support for the Injured Jockeys Fund
RELATED: 11 celebrity and royal mother of the brides that looked incredible at their daughter's wedding
Both Anne and Sir Tim were dressed in their naval uniforms, with their medals proudly on display.
The royal couple, who have been married since 1992, met personnel and their families at the event, which included a flypast by the Red Arrows.
Make sure you never miss a ROYAL story! Sign up to our newsletter to get all of our celebrity, royal and lifestyle news delivered directly to your inbox.