People.com reported the former co-star of "Roseanne" and "Best Damn Sports Show Period" tied the knot with Groussman Saturday at a ceremony attended by about 75 family and friends, including actor Dax Shepard, who served as Arnold's best man.
The couple reportedly met in April 2008 and got engaged last March at Arnold's 50th birthday party.
The writer, actor and television personality was previously married to Roseanne Barr, Julie Champnella and Shelby Roos. All three marriages ended in divorce.
His film credits include "Gardens of the Night," "True Lies" and "Nine Months."