Wealthy Mary Haines is unaware her husband is having an affair with shopgirl Crystal Allen. Sylvia Fowler and Edith Potter discover this from a manicurist and arrange for Mary to hear the gossip. On the train taking her to a Reno divorce Mary meets the Countess and Miriam (in an affair with Fowler’s husband). While they are at Lucy’s dude ranch, Fowler arrives for her own divorce and the Countess meets fifth husband-to-be Buck. Back in New York, Mary’s ex is now unhappily married to Crystal who is already in an affair with Buck.
Philadelphia heiress Tracy Lord throws out her playboy husband C.K. Dexter Haven shortly after their marriage. Two years later, Tracy is about to marry respectable George Kittredge whilst Dexter has been working for “Spy” magazine. Dexter arrives at the Lord mansion the day before the wedding with journalist Mike Connor and photographer Liz Imbrie, determined to spoil things.