"I'm very proud to be in the September issue of Vogue alongside my attractive big sister talking about our bond, who we are and what we stand for", she captioned the picture in which she sports a sultry bright red lip and chic, belted black coat.
Speaking to British Vogue, the York sisters discussed their unique position, sharing how tough it can be to get the balance right. "It's so easy to recoil when you see a ideal image, but it's important that it's real".
Beatrice: "It's hard to navigate situations like these because there is no precedent, there is no protocol".
"There was a frightful article that had been written about Beatrice and she got really upset", she said.
Back in June, Eugenie uploaded a picture of her father, Prince Andrew, during Trooping the Colour to celebrate his first time riding on horseback during the parade. Eugenie officially joined Instagram in March (and Beatrice secretly joined, as accidentally revealed by her BFF Karlie Kloss last week).
O´Connell takes Stade Francais role
Paul will bring his value and experience to our team thanks to his leadership ability and tactical and technical knowledge.
Sisters that just happen to be royal princesses may seem like the plot for a Disney movie (Frozen, if we want to be technical), but it's not as glamorous as you might think. "All my life I thought, 'Oh, what's she crying for?' It's lovely, it's a great day".
"Jack and Eugenie are very contemporary, they are very inclusive, and they are all about love, and they want this wedding to be about that - to include everybody and to really absorb the love they have for each other with everybody else".
She said: "Eugenie is very controlled - she is so sorted".
Beatrice: "One of the biggest fights we ever had was about a pair of Converse trainers".
The September issue of Vogue is hailed as one of the most prolific in the fashion calendar - it's considered a marker for the changing season - making it a huge deal for the well-known sisters to be featured in the upcoming edition.