The unnamed observer confirmed to People.com the ceremony took place with the couple's children -- Ella Rae, 5, Michael, 3, and Brendan Joseph, 10 months -- and about a dozen friends and family in attendance at Good Shepherd Catholic Church.
Wahlberg, 38, was decked out in a dark suit and Durham, 31, wore a white strapless dress with silver embroidery.
"She looked like a princess and beyond stunning. Mark looked ecstatic," the witness told People shortly after the ceremony.
Walhberg's film credits include "The Departed" and "The Perfect Storm."