One day after they tied the knot in a required civil ceremony Prince Albert and Charlene Wittstock have said 'I Do' again during a magnificent religious ceremony.

Wearing a stunning Armani gown, the former Olympic swimmer wowed the 850 guests attending the service held in the courtyard of the Prince's Palace.

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Standing before the Archbishop of Monaco the pair exchanged Cartier rings and listened to readings by the Prince's nieces before walking back up the aisle as husband and wife.

There's a new princess in town!

Prince Albert has married his girlfriend Charlene Wittstock, who is now officially Princess Charlene.

Princess Charlene of Monaco and Prince Albert II of Monaco Civil Wedding

Wearing a sky-blue jacket and skirt, 33-year-old Princess Charlene smiled as she said "I do" in the civil ceremony in the throne room of the Royal Palace in Monaco.

Those royal weddings just keep coming!

Controversial Prince Albert of Monaco is set to marry his girlfriend Charlene Wittstock.

The couple will wed in a 40 minute civil ceremony at the Royal Palace Friday before having a more public Catholic church service in Monte Carlo on Saturday in celebrations that are costing an estimated $90 million.

The couple will exchange vows before a star-studded guest list which will include Naomi Campbell, Karl Lagerfield, Roger Moore and French President Nicolas Sarkozy.