Star-studded wedding for Prince Albert

The second day of their royal wedding was to be marked with a spectacular open-air religious ceremony in front of 800 honoured guests, including President George Abela and his wife, and 3,500 of their subjects in the courtyard of the Grimaldi clan's fortress-like palace.

Organisers hope the glamour of the spectacle will overshadow what senior Monaco officials now privately admit is the "truth" of the rumour that Albert II faces a paternity test following a claim by at least one former lover.

Albert, at 53 is twenty years older than his blonde bride, has two children from previous relationships, but even if a third or a fourth is confirmed he will still not have an official heir until his lawful wife bears him one.

Charlene appeared tense but poised at her civil marriage ceremony on Friday in the throne room of her palace, but relaxed slightly at a buffet reception for Monaco's people, where she posed for pictures and hugged babies.

Later, she and the prince joined an estimated 80,000 people, double the normal population of the state, at the waterfront for a spectacular sound and light show by veteran French electropop pioneer Jean-Michel Jarre.

The Armani-clad bride and her beau plan to cross the city state in an open topped Lexus hybrid, a gesture to the prince's green credentials amid otherwise extravagant scenes of champagne quaffing and fireworks.

Indeed, whatever carbon is offset by the couple's choice of vehicle, will itself be more than compensated for by the 200-strong fleet of BMX 7 Series saloons that will ferry the guests to the ceremony.

The wedding feast will be held at Monaco's landmark casino, a site of true glamour in an otherwise slightly grim jungle of concrete 1970s blocks, and -- with private banking -- the source of much of the city-state's wealth.

The most senior guest will be France's President Nicolas Sarkozy, whose pregnant wife Carla Bruni is holidaying at her family's nearby villa, and Britain's royals will be represented by Elizabeth II's youngest son Prince Edward.

Several more European and African kings and princes will be there, along with supermodels such as Naomi Campbell and several sporting friends of Albert and Charlene, who have both represented their countries at the Olympics.