The American Idol alum, 27, and Fisher, 30, married at a luxury resort in front of 250 family and friends, the magazine reports.
"We could not feel more blessed to have found each other and to have shared this day with our friends and family that mean so much to us!" the couple told People in a statement signed "Mike & Carrie Fisher."
Underwood walked down the aisle in a Chantilly lace dress by Monique Lhuillier, who also designed the bridesmaids' dresses.
The country singer and Fisher, who plays for the Ottawa Senators, got engaged in December after dating for a year.