The surprise wedding on Friday night was a small, intimate ceremony in California, witnessed by approximately 40 friends and relatives, according to People.com.
"LeAnn and Eddie were happily married...surrounded by their closest family and friends," said a spokesman for the bride. "They thank everyone for their well wishes."
Cibrian's sons from his first marriage (Mason, 7, and Jake, 4) were among the guests, who had all been invited to a party on the premise of celebrating the couple's engagement. Instead, on a private Malibu property overlooking the Pacific, the country singer and the actor exchanged marriage vows and wedding bands.
Their engagement happened in December when Cibrian popped the question with a five-carat diamond ring. About her fiance, Rimes tweeted, "The ring is beautiful, man is better :)"
Earlier, this month, Rimes was spotted looking thinner than usual, but she fired back against allegations of an eating disorder.
Another thing she has staunchly defended is her relationship, even though it began in 2009 as an extramarital affair on a TV movie set while both were still wed to their previous spouses. "I didn't have the tools to know how to do it the right way, how to let go the right way," Rimes recently said of ending her marriage to Dean Sheremet, who's now engaged to a new girlfriend. "I'd never been taught that."
Cibrian was in an eight-year marriage to Brandi Glanville, the mother of his two sons, when he first fell for the Grammy-winning singer. In January, Glanville said, "There is still a lot of animosity, but hopefully, one day, we can move through that and get to a better place."