The wedding took place in Ravello, an Italian town on the Amalfi Coast, reported Us weekly.
Riley took to Instagram to share a black-and-white photo of their celebrations.
"This one seems fertile. She shall make a satisfactory first wife," Riley captioned the picture of the newlyweds sitting on the ground laughing while at their wedding.
Caplan, 35, and Riley, 36, got engaged in May 2016.
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