Dale Evans met Roy Rogers when she was cast opposite him in the leading role of "The Cowboy and the Senorita" in 1944. They were a big hit together and, I guess, with each other too! They went on to perform in many other features together and were married in 1947. Both Roy and Dale had been married previously and each had 1 child.
But, WAIT! Instead of me giving you all the details, you should check out this great site that explains their professional career in films and TV, Roy's proposal to Dale (in the Dale Evans Queen of the West section), and much, much more about their personal life and their Happy Trails Children's Foundation, including lots of fun events that you can participate in.