EXCLUSIVE: Princess Alexandra de Hanovre and boyfriend Ben-Sylvester Strautmann on a yacht during holidays in St-Tropez. 05 Jun 2021 Pictured: Princess Alexandra de Hanovre and boyfriend Ben-Sylvester Strautmann on a yacht during holidays in St-Tropez. Photo credit: MEGA TheMegaAgency.com +1 888 505 6342