INSIDE BEATRICE AND EUGENIE'S ROYAL SISTER ACT

How the Princesses' loyalty to the royal family, sense of duty and unbreakable bond could make them the Prince of Wales's secret weapon when he becomes King

- TRACY SCHAVERIEN

Wrapping their arms around each other, Princesses Beatrice and Eugenie made their sisterly bond plain to see as they walked through the gardens at Chelsea Flower Show.

The King's nieces looked as close as ever as they enjoyed an afternoon at the annual event last month, with the Prince and Princess of Wales also among the VIP guests.

"Such a lovely afternoon visiting the @the_rhs Chelsea Flower Show, especially when I get to do it with my sis!" Eugenie wrote on Instagram later.

The siblings have always had a special relationship, cheering each other on as well as holding each other up. Recently, they have been publicly supporting their uncle the King and the wider royal family, too - something we could see a lot more of in the future.

Beatrice and Eugenie, who are ninth and 12th in line to the throne respectively, are not working royals. But that could change once Prince William becomes King, according to one royal expert.

POTENTIAL PROMOTIONS

"When William ascends the throne, Beatrice and Eugenie will be valuable assets, and I'm certain they will get involved with royal duties. It makes perfect sense, because he will need them," Ingrid Seward, royal author and editor in chief of Majesty Magazine, tells HELLO!.

"I see them as a sort of double act, working together in the same way as married couples do. Two gorgeous Princesses working together as sisters would be very powerful. I think it would be wonderful, and I think it will happen."

Although they do not carry out official duties, the sisters often step up in an unofficial capacity. Last month, Eugenie, 35, joined William and Kate as they hosted the first of the season's garden parties at Buckingham Palace.