The 31-year-old actress, best known for her role in the Oscar-winning American Beauty, tied the knot with concert producer Simone Sestito following a two-year engagement.
A guest at the wedding told People: "The ceremony was truly unique and Mena looked breathtaking. They are very much in love."
The couple, who met in 2007 at the Toronto Film Festival, have organised a private reception for friends and family outside of the city.
Speaking of his relationship with Suvari in 2008, Sestito explained that the couple "just understood each other".
"She's very caring and understanding," he added. "There was a connection."
Suvari had expressed her desire for a "big Italian wedding" with Sestito as far back as October 2008.