It's a big day today and a cause for celebration for Princess Beatrice and her husband Edoardo Mapelli Mozzi . That's because their young daughter Sienna turns three today and the pair will no doubt be doing what they can to make it special. Over the past few years, Sienna's birth, as well as the arrival of her cousins August and Ernest - the sons of Princess Eugenie - have shaken up the royals' line of succession.

But unlike her cousins, Sienna, who is 10th in line to the throne, is actually eligible for a title - and it's not down to her mum Beatrice, it's all thanks to dad Edo. He is actually an Italian count, which means his children also inherit a count or countess title. Speaking to the Daily Mail before the pair wed, Edoardo's dad, Count Alessandro Mapelli Mozzi, explained: "Edoardo is the only male descendent taking the family into the next generation.

He is a count, his wife will be a countess automatically and any of their children will be counts or nobile donna." Neither Beatrice nor Eugenie's children are entitled to British royal titles as they are not grandchildren of the monarch - King Charles is their great-uncle. Last year, the children's grandmother Fergie spoke out about her pride in her grandchildren in an episode of her podcast Tea Talks with the Duchess and Sarah.

She told how she enjoyed spending time with Sienna, with Fergie looking after the toddler while Beatrice was in Jordan for the wedding of Crown Prince Hussein and Princess Rajwa last June. She .