"I'm married to my best friend!" Lambert, 27, told the magazine. "Looking forward to a lifetime of laughter."
Added Shelton, 34: "I wanted to be married to Miranda the day I proposed. Finally, it's official!"
Lambert said "I do" in her mother's wedding dress in front of 550 guests, including Reba McEntire, Cee Lo Green, Martina McBride and Dierks Bentley. The ceremony took place Saturday at Texas' Don Strange Ranch.
The country singers became engaged a year ago and have been dating since 2006. This is Lambert's first marriage. Shelton previously was married to Kaynette Williams from 2003 to 2006.
Lambert won her first Grammy earlier this year and plans to begin work on her fourth studio album. Shelton is one of four mentors on The Voice and will release a new album this summer.