"I had the great joy of marrying my best friend @oliviajune today!" Zak tweeted, along with a photo of him and his new bride. "It went awesome and we couldn’t have tied the knot on a better day. #WorldMentalHealthDay."
Zak, 37, and Olivia, 34, tied the knot at The Paramour Estate in Los Angeles, according to People magazine. Last year, the couple welcomed their first child together, a baby boy named McLaurin Clement Williams.
McLaurin was the middle name of Robin Williams, who died by suicide in 2014.
Zak, a mental health advocate, told People he’s "looking forward to building this life" with Olivia and their young son.