“You could tell the sparks were flying with Lucy,” says Eddie Bracken, a costar in the film. “It happened so fast it seemed it wouldn’t last. Everybody on the set made bets about how long it would last.” But the 28-year-old B-movie queen and the 23-year-old Cuban bandleader were entranced. “She talked about Desi all the time,” recalls her friend, actress Maureen O’Hara. “I said, ‘Go ahead and marry him if you love him.’ ” Six months later they did, forming a union that would produce two children, an entertainment empire and one of the most watched television series of all time.