Keifer and Shawna Thompson are one of two couples on this list that were a pair before their country music career took off. The Thompson Square partners wed in 2000 and pursued solo careers before looking each other one day and saying, "Hey! I got an idea." OK, we don't know if that's how it happened, but it did take a few years to figure out.

T2 hit big in 2010 with 'Are You Gonna Kiss Me or Not,' and fans got to see their playful romance on the small screen in an adorable music video that helped the hit become one of the most-played that year.