Don Carlos wants to see the girl he is to marry. He goes to France and, secretly, joins a royal hunt in which Elisabeth is taking part. Elisabeth and her page are separated from the others. Carlos speaks to her and offers to take her home. The princess asks him about the prince she is to marry. Carlos says that she need not worry because the prince is kind and in love with her. He then shows Elisabeth a photo of the prince, and then Elisabeth of course realizes that it is the prince she is talking to. They sing a love duet.