Underwood began dating NHL player Mike Fisher after they met at one of her concerts in late 2008, and she became engaged to him in December 2009. According to the Canadian press, Fisher proposed in Ottawa on December 20. Underwood's engagement ring features a yellow diamond and was valued at $150,000. On July 10, 2010, Underwood and Fisher wed at The Ritz-Carlton Lodge in Greensboro, Georgia, with more than 250 people in attendance. The couple's first son, Isaiah Michael Fisher, was born in 2015. In 2019, their second son, Jacob Bryan Fisher, was born.