Kate Middleton is not called “princess” like her late mother-in-law, Princess Diana, for a reason.

When Middleton and Prince William got married in 2011, she was called by some as Princess Kate. However, the name didn’t stick. People stopped calling her that way eventually and began to address her as Duchess of Cambridge.

According to InStyle, calling Middleton Princess Kate is “completely inaccurate.” Middleton isn’t formally known as a princess before she married Prince William. Her bloodline is among the reasons for this.

“Kate’s correct title is ‘Her Royal Highness the Duchess of Cambridge.’ She wasn’t born a blood princess, so she is not a princess in her own right...referring to her as ‘Princess Kate’ is simply incorrect,” royal expert Victoria Arbiter explained.

Middleton will be a queen consort when Prince William takes over the throne from Prince Charles. According to recent reports, the Duchess of Cambridge is already preparing for the said role. Charlie Proctor, editor of Royal Central, revealed that the royal mom of three’s preparations come in the form of behind the scenes work like attending meetings.

As a queen consort, Middleton’s main responsibilities will be to support her husband by attending engagements and going on foreign visits. There are already several signs showcasing Middleton’s bigger role. One was during Remembrance Sunday where she stood with Queen Elizabeth II and Camilla Parker Bowles on the same balcony.

Middleton’s sister-in-law, Meghan Markle, was on another terrace with German President Frank-Walter Steinmeier’s wife, Elke Büdenbender. Initially, royal fans thought that Markle was snubbed or that the terrace was too small for the four women. However, according to People, the royals were positioned that way for a reason -- pecking order. The Duchess of Cornwall and Duchess of Cambridge are future queens, and this is why they stood with the monarch.

Prince Harry is way down the line of succession and is unlikely to be king, so in turn, Markle only has a small chance of becoming the next queen. The Duke of Sussex is currently sixth in line and he will go further down the line if Prince William and Middleton will have more children.

Kate Middleton
Kate Middleton is not called “princess” like Princess Diana because doing so is inaccurate. Pictured: Middleton leaves the Royal Family's traditional Christmas Day service at St Mary Magdalene Church in Sandringham, Norfolk, eastern England, on Dec. 25, 2018. Getty Images/Paul Ellis