I did a quick Google and found a picture titled - "Faith Hill and Tim McGraw at the 74th Annual Academy Awards®". Not being a C&W buff I don't know what these fine looking people are all about. And yes, I should go to bed.
Faith Hill and Tim McGraw are born again Christians, and yes, married to each other, with a young family. Nashville Tennessee -- the home of Country Music -- is known as the Bible Belt; so these two are represented as the ideal of a Christian country music family -- hence, "First Couple."