The couple met on The Bachelor last year and got engaged in October.
People says that the couple have now married in a ceremony on the coast of Rancho Palos Verdes in California. Despite showers, the wedding took place outdoors on a lawn overlooking the Pacific ocean.
Malaney, who wore a $45,000 (£29,500) dress, walked down the aisle as American Idol contestant Jason Castro sang 'Over The Rainbow'. At the end of the 15-minute ceremony, the couple released white doves into the sky.
Former Bachelor and Bachelorette contestants were among the 300 guests. Jillian Harris, who starred in the same season as Mesnick and Malaney, said that she is "really excited" for the couple.
"They are very 'normal' in one sense, but on the other hand both of us have been through things in terms of the tabloids and drama after our shows were over," Harris added. "We're so sympathetic to each other's relationships that we're huge supporters of each other."
Mesnick and Malaney will now jet off on a tropical honeymoon before returning to their home in Seattle.
The Bachelor: Jason And Molly's Wedding will be broadcast on ABC on March 8.