The American Idol first-season runner-up wed former high school sweetheart Reina Capodici on Saturday in his hometown of Dolestown, PA, Us Weeklyreported.
"The wedding went off without a hitch," Guarini's representative Jeff Ballard told Us.
The wedding was held at a private estate along the Delaware River and included music arrangements by he Vitamin String Quartet and a reading by Capodici's 4-year-old daughter from a previous relationship.
"Justin is one of the most deserving people of happiness and love," former Idol finalist Kimberly Caldwell -- who is also Guarini's co-host on the TV Guide Network's Idol Tonight -- toldPeople. "I know he will be an amazing hubby."
While Guarini and Capodici were an item in high school, they subsequently lost touch and only rekindled their romantic relationship in 2007. They got engaged in December during a trip to Walt Disney World Resort in Orlando.
Guarini plans to begin work on his third studio album this winter.