The 55-year-old bassist married model Courtney Bingham, 28, on Saturday afternoon at Greystone Mansion in Los Angeles.
The wedding had a "goth rock meets French countryside theme," according to People.
"Hot damn. I'm a married man.... @how2girl looked absolutely beautiful.Now it's time to PARTY," he tweeted Saturday after the ceremony.
"Our beautiful day is here. Today I get to marry my best friend and love of my life," Bingham wrote.
Sixx and Bingham have yet to share photos of the actual wedding ceremony and reception, but they did offer up tiny details on Twitter and Instagram.
"Just threw my wedding suit on topped with a ton of chrome hearts jewelry & custom leather chucks W/ an old Keith Richards scarf #I'mReady," Sixx tweeted.
Laying out the jewelry for our wedding as I eat breakfast with my wonderful kids.... pic.twitter.com/99U0FYQUbx— Nikki Sixx (@NikkiSixx) March 15, 2014