The couple, who have been engaged since December 2007, had the ceremony MacArthur family home in Maine.
The Daily News reported:
Larter and MacArthur met when they co-starred in National Lampoon's "Homo Erectus" and became engaged in December 2007.
"Since I was 15 years old, all I wanted was to find the guy I was going to marry. My heart got broken so many times because I put so much pressure on it. And then…I got blindsided," Larter told February's Cosmopolitan magazine of her future husband.
Expect baby talk soon as the 33-year-old has never been one to take things slow.