Jessica Simpson tied the knot with former NFL player Eric Johnson at the San Ysidro Ranch in Santa Barbara, California.
"We are overwhelmed with complete happiness and love having made our eternal commitment," the newlyweds told PEOPLE in an exclusive statement on Saturday.
"To say 'I do' in front of family, friends and, most importantly, our children has been the happiest moment of our lives."
Simpson, 33, wore a custom Carolina Herrera gown to exchange vows with Johnson, 34, in front of more than 250 guests, including Ashlee Simpson and her fiancé Evan Ross, Jessica Alba, Cash Warren, CaCee Cobb and Donald Faison.
The couple's son, Ace, who just turned 1, served as a ring bearer and their daughter, Maxwell, 2, walked down the aisle as a flower girl accompanied by Ashlee's 5-year-old son, Bronx.
Simpson started dating Johnson four years ago, when they were introduced by mutual friends, and the pair instantly fell for one another.