Bennett's next serious relationship was with millionaire socialite Philip Morgan Plant. Her parents planned a cruise to Europe, taking Constance with them, to separate the couple. As the ship was preparing to leave port, however, the Bennetts saw Plant and his parents boarding, too. A contemporary newspaper article reported, "Now the little beauty and the heir to all the Plant millions were assured a week of the cosy intimacy which an ocean liner affords." In November 1925, the two eloped and were married in Greenwich, Connecticut, by the same justice of the peace who officiated at Bennett's wedding to Moorehead. They divorced in a French court in 1929.