After a three-year-plus engagement, the 33-year-old star married fiance Eric Johnson at San Ysidro Ranch in Santa Barbara, Calif. on Saturday, July 5.
The couple -- who has two kids together, daughter Maxwell, 2, and son Ace, 1 -- exchanged vows in front of family and friends at the lavish Southern California locale.
"We are overwhelmed with complete happiness and love having made our eternal commitment," the couple said in a statement to People. "To say 'I do' in front of family, friends and, most importantly, our children has been the happiest moment of our lives."
Jessica wore a custom Carolina Herrera gown for the ceremony, not the previously-reported pink Marchesa. The dress was champagne and gold and she paired it with Brian Atwood heels and Neil Lane jewelry. Check out the first look at her wedding dress below!
Sister Ashlee Simpson, her fiance Evan Ross, Jessica Alba and Topher Grace, CaCee Cobb and Donald Faison were all on hand for the ceremony. Ace acted as ring bearer, Maxwell was a flower girl and Ashlee's son Bronx accompanied her down the aisle. Ashlee and CaCee were bridesmaids.
The Beach Boys' song "God Only Knows" was also played during part of the ceremony, according to E!.
The celebrations actually started a couple days early, with a rehearsal dinner on Thursday evening and a big Southern-inspired BBQ buffet on the 4th of July for all of their wedding guests.
The singer's second wedding is a long time coming. Simpson and the former NFL pro first got engaged back in November 2010, just five months after they started dating. Wedding plans were put on hold, however, for the nearly back-to-back births of their children.
Best wishes to Jessica, Eric, Maxwell and baby Ace!
This is the second marriage for both. Jessica was previously married to Nick Lachey from 2002--2006, while Eric was legally married to (but separated from) wife of five years Keri Johnson when he met Simpson.
Click "Launch Gallery" above to see more celebrity weddings, and check out the photos below to see Simpson's skinny style.