The longtime couple, who have been engaged since 2010 and have two children together, finally tied the knot at the San Ysidro Ranch in Montecito, California on July 5 in front of family and friends, E! News reports.
The bride wore a custom Carolina Herrera gown, according to People.
Simpson's sister Ashlee and her fiance Evan Ross were in attendance, as well as the pair's friends including Jessica Alba and Topher Grace. Their 1-year-old son Ace was a ring bearer and their 2-year-old daughter Maxwell was a flower girl.
"I already feel like we're an old married couple," Simpson told "Good Morning America" earlier this year. "Like, if he wanted to run, he could've run when I was hormonal and pregnant."
Cheers to the happy family!