Princess Olympia of Greece is an accomplished fashionista, and on Christmas Day, she proved just that as she surprised with her unusual festive attire. The 29-year-old daughter of Crown Prince Pavlos and Princess Marie-Chantal was seen spending the big day on a boat, and though the location was undisclosed, it was abundant in crashing waves and beaming sunshine.  Olympia was seen donning a zebra print string bikini, styled with a paisley print red bandana on her head, and oval sunglasses. The royal could have easily been model and beauty entrepreneur Hailey Bieber, who took to Instagram in May 2025 to share a mirror selfie where she donned a bikini that was almost identical to Olympia’s.  String bikinis proved popular among A-listers in 2025, from Hailey to her bestie Kendall Jenner, as well as singer Dua Lipa and actress Jessica Alba. The style was a hit with the style set due to its alignment with a minimal, clean sense of style and also for practical reasons – less fabric means a more even sun tan! The …