The Rifles Chief Colonel Camilla, 74, was joined by the Countess of Wessex at the glamorous event at the City of London Guildhall.
She looked elegant in a floor-length black gown paired with standout jewelry while the Countess, whose role is the Royal Colonel, wore a bright blue maxi dress.
The Duchess and the Countess were joined on the occasion of the Biennale by the Queenfirst cousins of the Duke of Kent and the Duke and Duchess of Gloucester.
Camilla looked happy and chatted with people as she arrived at the reception for members, veterans and specially invited guests.
During dinner, she gave a speech to the guests.
In July 2020, the Duchess of Cornwall took over the role of Colonel-in-Chief of the Rifles from her stepfather the Duke of Edinburgh in two ceremonies at Highgrove and Windsor Castle.
The Duchess of Cornwall made her first visit to the Rifles headquarters in September.
The Rifles were formed in February 2007, following the amalgamation of four famous infantry regiments – the Devonshire and the Dorset Light Infantry; The Light Infantry; The Royal Gloucestershire, Berkshire and Wiltshire Light Infantry; and the royal green jackets.
Forged during the Iraq and Afghanistan campaigns, they are now the largest infantry regiment in the British army. Their motto is: “Swift and Bold”.