Prince Albert of Monaco's upcoming Royal Wedding is indeed a political necessity for the people of Monaco. That is because, If the Grimaldi House fail to produce a legitimate heir, their country will be succumbed by France, according to this 1918 Treaty:
"Article 3. His Serene Highness the Prince of Monaco, in accordance with the additional articles of the Treaty of 2 February 1861, 2 confirms for himself and his successors the commitment assumed towards the French Government not to alienate the Principality, in whole or in part, in favour of any Power other than France.
Should the throne become vacant, particularly for lack of a direct or adoptive heir, the territory of Monaco shall form, under the Protectorate of France, an autonomous State under the name of the State of Monaco. In such case, immovable private property, which has not been appropriated for public use and which might accordingly be the subject of a private claim by the rightful owners, shall be purchased by the State of Monaco with the assistance, if necessary, of the French State."
So that's what a Royal Wedding is for, to keep your country from being baked into a croissant! Yeah, better get married soon.. :)