"After careful thought and much consideration, Sean has made the difficult decision to call the wedding off," the rep said.
"The recent rumors and accusations reported by so-called or fake sources are simply untrue. Sean wishes Naya nothing but the best and it is still his hope that they can continue to work through their issues privately. We will not be commenting again on this matter."
The pair got engaged last October, just six months after going public with their relationship.
There were no signs of a split as recently as January, when Rivera gushed about her then-fiance in an interview with Cosmopolitan Latinas.
"I think he's going to be an amazing husband, and he'll make a great father someday," she said. "He's so kind to people, but he also wears the pants in our relationship, which I love. We Latinas are very independent and strong, so it's even sweeter that I've found somebody who can let me out of that role for a minute."