The ceremony last year between Nielsen, 42, and Dessi, a 28-year-old Italian former model, was "more like an official engagement," said Nielsen's manager, Luigi Balduini.
They officially tied the knot in Malta, People reported. Their earlier ceremony took place in the Dominican Republic, while Nielsen was still married to former racecar driver Raoul Meyer.
Nielsen has appeared in such movies as "Rocky IV" and "Beverly Hills Cop II." She was previously married to Sylvester Stallone and has a son with former NFL star Mark Gastineau.