Kisses for Breakfast (1941)

Rodney has just married the often engaged Juliette and they are both ready to leave on their honeymoon. However, Clara showed up and Rodney sneaks out to talk to her. Clara is blackmailing Rodney, as he knew her before Juliette. Clara's accomplice hits Rodney over the head when he refuses to pay. This causes amnesia and the only name Rodney can find in his pockets is Laura Anders - who is Juliette's cousin. Laura had never met "Rodney" so she does not know him. Laura and "Rodney", still not remembering who is really is, get married on their way to Juliette's house. When "Rodney" is recognized everyone tries to keep Laura and "Rodney" from starting their honeymoon. Mayhem ensues.