Having supped full of success with the multi-storied O. Henry's Full House, 20th Century-Fox assembled another all-star "omnibus" film, We're Not Married. The unifying factor of this enjoyable seriocomedy is provided by justice-of-the-peace Melvin Bush (Victor Moore), who learns to his horror that his license is invalid. Bush and his wife (Jane Darwell) feverishly track down the five couples whom he has married "illegally" to inform them of the fact and invite them to renew their vows. Couple #1 is Fred Allen and Ginger Rogers, a husband-and-wife radio team whose huggy-kissy behavior on the air conceals the fact that they'd dearly love to cut each other's throats. Couple #2 consists of David Wayne and his contest-happy spouse Marilyn Monroe, who's just won the "Mrs. Mississippi" pageant. Couple #3, Paul Douglas and Eve Arden, ran out of things to say to each other long ago. Couple #4 is millionaire Louis Calhern and his avaricious young bride Eva Gabor, who intends to jilt the old coot and make off with his millions. And Couple #5 is young GI Eddie Bracken and his pregnant wife Mitzi Gaynor. When Bush delivers the news that these unions aren't legal in the eyes of the state, the results range from poignant to hilarious: particularly satisfying is Calhern's puckish revenge on his gold-digging wife. And yes, that is Lee Marvin as Eddie Bracken's army buddy.
~ Hal Erickson, All Movie Guide