Monaco's Prince Albert took girlfriend Charlene Wittstock to watch tennis star Rafael Nadal win his 24th title.
The couple were in the stands of the centre court at the Monte Carlo Masters to witness Nadal beat Roger Federer in straight sets to become the first player to take crown in four successive years.
The 50-year-old prince was first revealed to be dating the South African beauty when they were spotted at another sporting event - the 2006 Winter Olympics opening ceremony in Turin, Italy.
Recent reports suggest the prince will marry Charlene, who is 20 years his junior, in September this year.
Albert, whose former girlfriends include Brooke Shields and Naomi Campbell, has two children - Alexandre, four, from a relationship with flight attendant Nicole Coste and 16-year-old Jazmin who was born after a brief fling with Californian Tamara Rotolo.