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Lady Louise Windsor has turned 18 and can now choose if she wants to be a princess

Queen Elizabeth's granddaughter can choose whether to adopt her royal title now that she's officially an adult.
Royal Windsor Horse Show 2021
Lady Louise Windsor is Queen Elizabeth's youngest granddaughter and the oldest child of Prince Edward and Sophie, Countess of Wessex.Steve Parsons / PA Images via Getty Images
/ Source: TODAY

Turning 18 traditionally comes with plenty of life-changing decisions, including which university to attend, where to work and whether to move out.

For Lady Louise Windsor, the milestone birthday comes with one very regal dilemma — whether she should become a princess. Queen Elizabeth's youngest granddaughter and the oldest child of Prince Edward and Sophie, Countess of Wessex, celebrated her 18th birthday on Monday.

Prince Harry Marries Ms. Meghan Markle - Windsor Castle.
Lady Louise Windsor and her mother, Sophie, Countess of Wessex, attend the wedding of Prince Harry and Meghan Markle.Max Mumby / Pool via Getty Images

The young royal, who is 16th in line for the throne, now has a very important decision to make. While it's not yet known what Lady Louise will choose, her mother explained in an interview with the Times of London last year that she has been raising her children to be practical about the lives and careers they may have as adults.

BRITAIN'S EARL AND COUNTESS OF WESSEX HOLD THEIR DAUGHTER LOUISE AT SANDRINGHAM.
Lady Louise Windsor, the first child of Prince Edward and Sophie, Countess of Wessex, was born on Nov. 8, 2003.HRH The Duke of York via Reuters

"We try to bring them up with the understanding they are very likely to have to work for a living," the Countess of Wessex said. "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."

Lady Louise is entitled to become a princess, according to the 1917 Letters Patent, which decrees that all children of the monarch's male heirs can be a prince or princess and use the title His or Her Royal Highness.

Britain's Prince Edward, his wife Sophie, Countess of Wessex and their daughter Lady Louise Windsor
Lady Louise celebrated her grandmother Queen Elizabeth's Diamond Jubilee in 2012.Andrew Winning / Reuters

That explains why Princess Beatrice and Princess Eugenie, who are Lady Louise's cousins, use the HRH title and are princesses. However, Princess Anne's children, Zara Tindall and Peter Phillips, do not have royal titles.

Lady Louise's brother, James, Viscount Severn, who is 13, will also be able to decide his title when he becomes an adult.

Trooping The Colour 2018
Lady Louise Windsor, Princess Eugenie and Princess Beatrice stand on the balcony of Buckingham Palace during Trooping The Colour 2018. It's unclear yet whether Lady Louise will join her cousins by adopting the title of princess.Max Mumby/Indigo / Getty Images

If Lady Louise decides to join her cousins and style herself as a princess, she'll be known as Her Royal Highness Princess Louise of Wessex, and could one day take on more royal responsibilities, including royal tours and patronages.