"After careful thought and much consideration, Sean has made the difficult decision to call the wedding off," a rep for Big Sean said in a statement obtained by E! News. "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."
Last night at the Marie Claire Fresh Faces event in Los Angeles, a subdued-looking Rivera was not wearing the massive diamond ring that her now ex-fiancé gave her.
Big Sean was attending a Dodgers game across town while Rivera was at the event.
The "recent rumors and accusations" Big Sean's rep referred to in the breakup statement apparently include a recent Star magazine report claiming that the rapper had cheated on the Glee star.
Sadly, the relationship is over roughly a year after they first went public as a very hot-for-each-other couple.
Rivera said in the January issue of Cosmopolitan that she felt that Big Sean would make "an amazing husband" and "an amazing father one day."
"He's so kind to people," the smitten star said, "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."
The brunette bombshell (though she's a little less brunette these days) also noted that she has quite the lingerie collection, joking, "We have sex everywhere!'
Us Weekly was first to report the split news.