If being in love makes your heart do somersaults, then Princess Caroline's son Pierre Casiraghi has clearly fallen hard for his girlfriend of one year, Italian society beauty Beatrice Borromeo.
As the loved up pair soaked up the sun on a luxury yacht in Grosetto, Italy, the handsome Monegasque royal went head over heels – literally – albeit over the side of the boat.
Energetic Pierre and Beatrice have been inseparable since they met while studying at Milan's Luigi Bocconi University. Beatrice, a part time model and the daughter of a count, is working towards a law degree.
Meanwhile 21-year-old Pierre is reading Economics. He's expected to put his studies to good use working in the companies of his late father Stefano Casiraghi, who passed away in 1990. The businesses are currently being managed by his uncle Marco.
For now, studying seems far from Pierre's mind, however, as he makes the most of his summer break with Beatrice. The jet-setting couple were last month spotted cruising the azure waters of St Tropez together.