The pair married during the weekend in Torino by Mayor Sergio Chiamarino in a "quiet elopement, not a big, formal church wedding," the rep said.
Carradine, 57, and DuMond, 32, co-starred in the 1999 Burt Reynolds movie, "The Hunter's Moon," People magazine reported.
Carradine, whose brother David starred in "Kill Bill: Vol. 1 & 2," played Wild Bill Hickok on HBO's Deadwood. He also recently hosted The History Channel's "Wild West Tech."
Carradine has two grown children from his previous wife, Sandra Will. He is also actress Martha Plimpton's father.
DuMond recently finished filming for the film "All In."