MONACO — Monaco’s Prince Albert II and Princess Charlene promised each other love and fidelity in an extravagant religious wedding Saturday attended by international celebrities and royalty, bringing new allure to the tiny principality known for its luxurious casinos and as stomping ground for the rich and famous.

The Catholic service followed an intimate civil ceremony Friday, which saw Charlene officially transformed from commoner into royalty. The marriage of the 53-year-old prince and the 33-year-old Charlene Wittstock, a one-time Olympic swimmer from South Africa who is now known as Princess Charlene, ended a three-decade wait for a new princess.

The last wedding of a ruling prince in Monaco was in 1956, when Hollywood star Grace Kelly married Prince Rainier III.

Saturday’s ceremony was attended by guests including former James Bond actor Sir Roger Moore, French President Nicolas Sarkozy and bohemian designer Roberto Cavalli, of Italy. Thousands of Monegasque citizens cheered the proceedings while watching on large screens set up outside the palace, where both ceremonies were held.