This is the name Princess Charlotte will use when she starts school tomorrow

It looks like Princess Charlotte will be going by a very different name when she starts school tomorrow.

The daughter of the Duke and Duchess of Cambridge will be joining her older brother, Prince George, at St Thomas’s Battersea on Thursday. And beyond the sure-to-be adorable drop-off photos from the first day of school, the young royal will be going through another massive change - and, according to a number of outlets, will be going by a very different name. PEOPLE report if the four-year-old follows in the footsteps of her brother, then she will be known as Charlotte Cambridge. Prince Harry and Prince William both used the surname Wales during their school days, as well as when they were in the army, as their dad is the Prince of Wales. And since Prince William is now the Duke of Cambridge, his three children are likely to follow the tradition and use his title as a surname. It comes as a royal insider said Prince George, who will be starting his third year at St Thomas's Battersea, will be a "protective older brother" when his sister joins him at school. Royal biographer Penny Junor told Hello (via The Daily Mail):

"Prince George is a very protective and lovely older brother. I'm sure he'll look after his little sister and take great pride in showing her the ropes."

Simon O'Malley, Headmaster at Thomas's Battersea, previously said they "greatly look forward" to welcoming the young royal when she started school. He continued:

"We are delighted that The Duke and Duchess of Cambridge have decided that Princess Charlotte will join her elder brother, Prince George, at Thomas's Battersea. "We greatly look forward to welcoming her and all of our new pupils to the school in September."