The Italian heiress, 19, commanded attention in an eye-catching scarlet polka dot suit as she stepped out at the Giorgio Armani show during Paris Fashion Week.
The eldest son of Queen Mary is now next in line to the Danish throne after his father King Frederick X yesterday replaced Queen Magrethe II as monarch following her shock abdication.
The glamorous Italian heiresses took to their Instagram accounts over the weekend to show off moments from their trip to the British capital - including getting stuck on the London Eye.
The future King celebrated his 18th birthday with a glitzy gala dinner at the Christiansborg Palace last weekend - and guests included dazzling future Queens from across Europe.