Rita Hayworth - perhaps the most famous Hollywood royalty wife

She was married for a while to Ali Salman Shah, Prince Aga Khan. He was the son of Sultan Mohamed Shah, Aga Khan III. Being one of Hollywood's most glamorous stars at the time, it got a lot of press, needless to say. Prior to Hayworth, Khan had been married to the daughter of John Reginald Lopes Yarde-Buller, 3rd Baron Churston of Churston Ferrers and Lupton, whose lineage went far back into the bluebloods of England.