The intimate, all-white wedding took place at Carbon Beach in Malibu, and about 50 close friends and family attended, according to TMZ.
Will, 44, and Erin, 45, have two children together -- Cash and Scarlett -- who both reportedly played a special part in the family affair.
The pair welcomed their first child, Cash, in May 2010. Will and Erin then got engaged in August 2011 after dating for six years.
Will, a board-certified Beverly Hills dermatologist, proposed to Erin at the time with a nine-carat diamond engagement ring set in platinum, People previously reported.
Will reportedly popped the question following a romantic dinner on the ocean at sunset during which they feasted on grilled prawns, lobster, oysters, and a tomato salad -- a few of Erin's favorite dishes.
The couple's second child, Scarlett, was later born in September 2012.
Will -- who was more affectionately known as "Dr. Evil" -- won Season 2 of Big Brother in 2001 and claimed the show's $500,000 grand prize before returning for Big Brother 7: All-Stars in 2006, when he finished fourth.
Afterward, he also co-starred on E!'s Dr. 90210 reality series.
Over the last handful of years, Will has hosted the jury roundtable segment onBig Brother's season finales. And in 2016, Will won the celebrity edition of The Price is Right and donated his winnings to charity.
Erin appeared as one of the bachelorettes on For Love or Money's first season on NBC in 2003.