The ex-“Dawson’s Creek” star and wife Kimberly Brook welcomed daughter Olivia on Saturday.
"Had the blessing of becoming a father over the weekend... Couldn't come close to describing this bliss even if I had 140 million characters," Van Der Beek gushed online. "I apologize in advance for any obnoxiously precious new-dad tweets that may follow. I'm under her spell."
Van Der Beek later told People mag that Olivia came into the world weighing 7lbs., 2 oz.
“Best day of my life so far," he tweeted Aug. 1. “The woman I love did me the honor of became my wife today ... I look forward to earning her for the rest of my life.”
Van Der Beek has been married once before, to actress Heather Ann McComb.
The couple finalized a divorce in March after six years together.