Jack Brooksbank may not be a working royal or have a royal title, however he is part of the wider Royal Family, and will no doubt receive birthday wishes from them today as he turns 39. Since marrying Princess Eugenie in 2018, Jack has been seen at big royal events, however not many know much about him, with some not even knowing his full name.

During his wedding to Prince Andrew’s youngest daughter in 2018, Jack had to confirm his full name during the exchange of vows. And it couldn’t help but be noticed that he had one very unusual middle name - Stamp. This was revealed in the ceremony when he confirmed his name to be Jack Christopher Stamp Brooksbank.

It is not known why Stamp is one of Jack’s middle names. While he is now a member of the Royal Family since marrying Eugenie, he also descended from a baronet.

However, he comes from the only class of British nobility that isn't part of the peerage.

This explains why Jack has no royal title, including after his wedding to Princess Eugenie. Their two children Ernie and August also have no royal titles.

Despite this, the family do have a home on the Kensington Palace estate, as well as a property in Portugal.

While it is not known how Jack will be celebrating his big day today, it is believed he will be spending it with his wife, children, and other family members.

It is also likely Princess Eugenie may post a public birthday message to her husband via her Instagram account.

The princess, 35, previously took to social media a day after Valentine’s Day this year to express her love for her husband, writing: “My valentine!! Love you to the moon and back.. Happy Valentine's Day (for yesterday...whoops).”