Simpson, 33, and Johnson, 34, tied the knot at the San Ysidro Ranch in Santa Barbara, according to the magazine which received confirmation from the couple.
“We are overwhelmed with complete happiness and love having made our eternal commitment,” Simpson and Johnson said in a statement to People on Saturday.
The couple was joined by more than 250 guests, including Simpson’s sister Ashlee Simpson and her fiancé Evan Ross, Jessica Alba and Donald Faison.
The couple have two children, one-year-old Ace who served as a ring bearer and Maxwell, 2, who was a flower girl.
Simpson, a pop singer and Weight Watchers spokeswoman and Johnson, a former San Francisco 49ers tight end, began dating four years ago and became engaged in November 2010. (Reuters)