Miranda Lambert is one tough chick. She is the fastest girl in town, if you will. She doesn't strike anyone as insecure, since she oozes beauty, talent and confidence -- and she's also married to one of the most popular male performers in the country genre, Blake Shelton. Despite all of her blessings, however, in the February issue of Redbook the singer admits she can be unsure of herself here and there. In essence, she's human, just like the rest of us.