Robin Williams ties the knot

(CBS) Robin Williams has said "I do" for a third time.

The actor, 60, married graphic designer Susan Schneider on Sunday at the Meadowood Resort in California's Napa Valley, his rep confirmed to People magazine.

Pictures: Celebrity weddings and engagements

Rumored guests at the wedding, Us magazine reports, included Steven Spielberg, George Lucas and Billy Crystal.

Williams has three children from his first two marriages - Zachary, 28, with first wife Valerie, and Zelda, 22, and Cody, 19, with second wife Marsha, who filed for divorce in 2008.

On Saturday, Zelda tweeted: "Let the wedding madness begin!"

According to Britain's The Guardian, Williams and Schneider met in 2009, shortly before Williams underwent heart surgery. The paper also reports that she helped nurse him back to health after he went under the knife.