The royal sisters were accompanied by Beatrice's boyfriend Edoardo Mapelli Mozzi and an unknown blonde friend as the group rocked out in the VIP section.
The siblings looked uber stylish at the Celine Dion concert with Beatrice donning a printed Alexander McQueen dress teamed with white trainers.
Eugenie - who was significantly less excitable than her sister - looked casual in a printed midi dress while also wearing her signature pair of bold sunnies.
Royal fans were delighted to see Princess Beatrice dance as she belted out some of Dion's biggest hits such as 'My Heart Will Go On' and 'The Power of Love'.
This is Princess Eugenie and Princess Beatrice's first appearance together since Royal Ascot in June, and don't they look happy to be reunited!