Van Der Beek, 33, is best known for his work on the young-adult drama TV series "Dawson's Creek." He was previously married for six years to actress Heather McComb and began dating Brook about a year ago.
"The woman I love did me the honor of (becoming) my wife today ... I look forward to earning her for the rest of my life," UsMagazine.com quoted the actor as messaging Sunday.
Celebrity Breakups and divorces of 2014 [PHOTOS]