Robin Williams' son married his longtime love Olivia June on Saturday, he announced on Twitter. «I had the great joy of marrying my best friend @oliviajune today! It went awesome and we couldn’t have tied the knot on a better day. #WorldMentalHealthDay,» Zak wrote alongside a photo of himself and Olivia on their wedding day. The 37-year-old looked dapper in a bowtie, while Olivia offered a sneak peek at her wedding dress in the snap.