It's been a helluva year for the mom of three, who's up for Best Female Video at the CMT Awards for her "American Heart" clip: She just wrapped up a residency in Las Vegas where she performed for 10 weekends with husband Tim McGraw. She reportedly inspired lead character Rayna James in the ABC drama "Nashville." And at 45, she got braces ("I had braces as a kid. I forgot to wear my retainer," she explained to a radio station of the surprising accessories she sported at the 2013 Grammys). "I've always had a strong work ethic," she recently told People. "But it's greater now because I know they're paying attention. It's important for my girls to see I'm a working mom … that I had a dream and I'm still making it happen." And how.