The 57-year-old TV journalist married financier John Molner in East Hampton, NY, on Saturday.
"So excited to make my debut as Mrs. John Molner!" Katie tweeted along with a picture with her new hubby (below).
The blushing bride walked down the aisle wearing an ivory, crystal beaded and embroidered Chantilly lace halter gown with a high neckline, designed by Carmen Marc Valvo. She wore her short blonde hair in a chic updo, with chin-length tendrils framing her face.
Her husband, meanwhile, looked dapper in a dark blue suit and crisp white shirt.
The couple, who got engaged last September after dating for two years, tied the knot in the backyard of Couric's home in front of 50 friends and family.
"We wanted to keep the wedding just very low-key," Couric told People before the wedding. "This is not my first rodeo so I didn't want to go too crazy and neither did John."
Other guests included Couric's daughters Ellie, 22, and Carrie, 17, as well as Molner's children Allie and Henry.
This is the second marriage for both Couric and Molner. The former "Today" anchor's first husband, Jay Monahan, died from colon cancer in 1998.