A wedding cake was a multi-layered cake served at Human weddings.
The Silver Blood copies of B'Elanna Torres and Tom Paris had a wedding cake during their wedding ceremony in the mess hall. Crewman Fitzpatrick brought the cake into the room. The cake featured two figures of Torres and Paris on its top. (VOY: "Course: Oblivion")
William T. Riker and Deanna Troi had a wedding cake at their wedding in 2379. (Star Trek Nemesis)