Most couples have sweet pet names for each other, and it's no different for members of the royal family.
Prince Harry and Meghan Markle have been overheard using cute nicknames, as have the Duke and Duchess of Cambridge.
And according to a royal biographer, Charles has a nickname for his wife Camilla that dates back decades - and it could have a much deeper meaning.
Sally Bedell Smith spoke to the Royally Obsessed podcast about the Prince of Wales' relationship with his wife and told the story of Charles gifting Camilla a bracelet before he married Diana, Princess of Wales.
Sally told listeners: "It was a very simple bracelet, a little gold bracelet, with a blue disk on it."
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The royal biographer told the podcast the gift was one of dozen that the Prince of Wales had had made at the time, and according to a "solid source", Charles had given these as presents to special people in his life before he got married.
But Camilla's one was personalised with a nickname he has for her.
"It just said 'GF' and 'GF' meant 'Girl Friday'," Sally said. "That's what he jokingly called her. It just meant that she was sort of his companion, his helper."
She continued: "It could have meant that she was his Friday girl too. But 'Girl Friday' usually refers to someone who's a sort of Jill of all trades.
"She could help him out with things, and she was sort of reliable. Camilla would definitely fit that bill."
The 'GF' on the bracelet was originally thought to stand for 'Gladys and Fred' - character names from 'The Goon Show'.
These were nicknames that Charles and Camilla were known for using for each other when they first started dating.
After many years of on-off romance, the couple finally tied the knot in civil service at the Windsor Guildhall back in 2005.
But there was one thing that 'paralysed' Camilla with fear in the days running up to the wedding - how the world would react to the impending vows.
Speaking on the Channel 5 documentary Charles and Camilla: King and Queen in Waiting, royal expert Jenny Bond said: "I think Charles has always wanted to make Camilla his bride, his wife.
"I think he felt that she had endured a lot of really negative criticism over the years and she had taken it with a lot of dignity and all he wanted was to make her his wife."
But Camilla was reportedly "terrified" that nobody would be waiting outside after the couple walked out as husband and wife
"Having once been widely reviled as an adulteress, she was almost paralysed with fear," biographer Penny Junor explains.
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