The Duchess of Cornwall and pop singer Lady Gaga share a nickname, it has emerged.
As Camilla, accompanied by the Prince of Wales, arrived for Tuesday's (6 December) Royal Variety Performance, she said to the notoriously flamboyant performer: "My grandchildren call me Gaga."
The royal couple also met Robbie Williams as they arrived at London's Hammersmith Apollo.
Prince Charles, who arrived immaculately dressed in a black tuxedo, decided to pass on his style tips to the former Take That artist turned solo singer and told him to straighten his bow tie.
As the royal couple entered the venue they were greeted by comedian David Walliams, who asked them, "Can I see your tickets, please?" before joking to the group: "There's some riffraff here sitting in your seats."
Gaga and Williams were among the performers at the show, alongside Sting and Emeli Sande. Magician and Britain's Got Talent winner Richard Jones was also to perform.
Speaking during rehearsals for the big night, Lance Corporal Jones said: "It's a really exciting performance, telling a really poignant story which is really important to my family, in particular, but it should also touch the hearts of many people watching around the country.
"It's a big, heart-warming moment for the forces – but I don't want to spill the beans too much."
The soldier, from Essex, blew the nation away with his magical illusions on the TV talent contest earlier this year, earning himself the opportunity to perform in front of a royal audience.
Jones, 26, added: "I feel very privileged and honoured to be here, performing for the Royal Family as well, and then in front of the nation."
He said he remains passionate about his main job as a military musician, a role in which he performed in front of the Queen at her 90th birthday celebrations this year.
The Royal Variety Performance will be broadcast on ITV on 13 December.