Miranda Lambert is a sassy country singer, but she's also a big softy with a huge heart. The country superstar sang "Over You" to a 7-year-old fan fighting cancer, performing to a sold out Texas audience. The moment was so emotional that it left the singer in tears. Lambert noticed the little girl in the crowd, surprised to see someone so young at the concert. Then she took not of the girl's pink cowgirl hat and preventative mask. The singer bent down, grabbed the girl's hand, and sang to her before standing up and breaking down in tears, touched by...