It's a very special day for Lady Louise Windsor as she's celebrating her 18th birthday.
Louise, the daughter of Prince Edward and Sophie Wessex and the Queen's youngest granddaughter, will no doubt be enjoying her landmark day.
But it seems as well officially turning into an adult, she will now also have a big decision to make - and it regards her title.
When she and her younger brother James, Viscount Severn, were born, their parents decided against them using their HRH titles.
However, their mum Sophie revealed in an interview last year they do indeed have the titles, and it will be up to them when they turn 18 if they want to use them.
But she warned that it's "highly unlikely" they will decide to start using them and will prefer to stay as private as possible.
Speaking to the Sunday Times, Sophie said: "We try to bring them up with the understanding they are very likely to have to work for a living.
“Hence we made the decision not to use HRH titles.
"They have them and can decide to use them from 18, but I think it’s highly unlikely.”
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Louise, who has previously been called the Queen's favourite grandchild, has largely grown up out of the spotlight and currently attends a private school in Ascot.
She is studying for her A-levels, with her mum hoping she will attend university.
Sophie said: "I wouldn’t force her, but if she wants to. She’s quite clever."
She also told BBC Radio 5 : "I would hope that she can go on with her studies, which I think she probably will want to do, and I hope that she and her friends will protect her from anything that somebody might want to do.
"But I have to let her live her life. It's not mine to live. I can only equip her the best that I can, and then she has to make her own choices.
“But I hope for the next few years, at least, she will still be able to be as private as she wants to be."
In September, Louise made her public speaking debut in a series of interviews for a documentary honouring her late grandfather Prince Philip.
In the interviews, she spoke fondly of her grandfather - sharing her experiences of taking part in the Duke of Edinburgh's Award scheme.
She also talked about how she has taken up Philip's favourite sport of carriage driving and said: "The Duke of Edinburgh has been so involved in my driving, but it's slightly scary as he invented the sport pretty much.
"But it's incredible to have learned first-hand from him and it definitely made us closer I think."
And her appearance talking so movingly about her grandfather seemed to endear her to royal fans who were touched by her comments.
One wrote on Twitter : "I thought the star of this programme was easily Lady Louise. What a lovely girl she is."
Another said: "Wow how good was it to see Lady Louise Windsor in her first documentary."
While another noted: "Lady Louise has such fabulous memories of her grandfather, it was a beautiful interview & they must miss him very much."
