Oh, I almost forgot, but this makes Hollande the co-prince of Andorra now, too!
Wait, what? Isn't he a Socialist (specifically a member of the French Socialist Party)? Does that mean that there's a socialist monarch in the world right now?
Indeed, and it's not the first time.
In 1278 the Bishop of Urgell and the Count of Foix solved a dispute they had over Andorra and signed a paréage, declaring them to rule the territory jointly. The Count of Foix's descendants, inheriting their portion of control over Andorra, eventually became kings of France, and when France became a Republic the title passed to the French President.
So this is actually the fourth time, IIRC, a Socialist President has been His Serene Highness, Co-Prince of Andorra.