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.

Charlene swept along the red carpet leading into the palace on her father's arm. In her sumptuous boat neck gown by Giorgio Armani Prive, her hair pulled back in a swirling French twist and with only the lightest touch of makeup, she seemed to channel some of Grace's effortless elegance.

Vogue caught up with Charlene Wittstock, set to marry Prince Albert II at the beginning of July. The future princess discussed first meeting Albert at the 2000 Olympics (she's a swimmer), adjusting to life in Monaco and her plans to inaugurate a fashion week there.

On cultivating her personal style:

"Finding my fashion feet has certainly been the biggest challenge," she says, remembering her "trial by fire" at Monaco's 2007 Red Cross Ball. "'I was literally a fish out of water. I thought it was all fun, fun, fun, and didn't give my outfit any thought. I had been playing beach volleyball all day, painted my nails red, and threw on a green dress. I thought I looked great at the time, but looking back, I realize that my debut into Monaco society should have been better executed!"

On listening to other people about how she should dress:

"I was insecure. I felt pressure to err on the side of caution -- I was terrified of meeting a head of state in an over-the-top outfit....I've reached the point where I know what I like and what works. I'm starting to play with fresher, bolder, and more daring looks." She was helped by Giorgio Armani, who will dress her for the religious part of her wedding and who notes that her casual elegance and slender figure look equally good in suits and evening gowns with necklines "that emphasize the beautiful structure of her shoulders."

On her relationship with Karl Lagerfeld:

"Karl took me to his workshop in Paris. He said, 'You are going to be a style icon. You bring a breath of fresh air and modern glamour to Monaco.' Then he asked me if there was one item of clothing that I had always wanted to experiment with, and I replied, 'A smoking jacket.' He went back to his apartment and presented me with his own white shirt and smoking jacket from his closet."