Bruce Springsteen's daughter Jessica Springsteen
was also present at the horse riding event.
The 22-year-old, who is part of Gucci's kids team with her equestrian partner actor Guillaume Canet, showed her support for her good friend Charlotte
Charlotte and Jessica have long been friends thanks to their mutual love of horses and have competed together in events such as the Vienna Masters Global Tour.
Mum-of-one Charlotte's appearance at the show jumping tournament came a week after she and her boyfriend Gad Elmaleh baptised their son Raphäel.
VIEW GALLERY Princess Caroline presented Charlotte with the trophy
According to Paris Match, the couple invited their nearest and dearest to the chapel at Monaco's royal palace before enjoying a family lunch in the grounds.
Among the guests were Charlotte's mother Princess Caroline and her siblings Princess Alexandra, Pierre and Andrea Casiraghi, who was joined by his wife Tatiana Santo Domingo.
Charlotte's aunt Princess Stéphanie also gathered her three children Pauline and Louis Ducruet and Camille Gottlieb together for the family affair while Caroline and Stéphanie's brother Prince Albert also attended with Princess Charlene.
Representing Gad's side were the actor's mother and his 13-year-old son Noé from his previous relationship with French actress Anne Brochet.