The 7th Heaven star, who wed Grant in 1985, announced on Monday (07May12) that they had decided to part ways.
He stated, "My wife and I are moving forward separately in our lives. She has been my dearest friend and a loving mother. I know that we'll go through this process in a way that honours our family."
But Grant reveals she's been blindsided by the break-up.
She tells E! News, "Stephen's filing for divorce is a surprise. I am devastated. I wish him the very best in whatever path he chooses to take. Twenty-seven years of marriage in Hollywood is the equivalent of 189 dog years. I was exhausted."