2012 has been a banner year for the country singer: He's the breakout star of The Voice, the Academy of Country Music's reigning male vocalist of the year, and just earlier this month, he nabbed three CMA Awards, even sharing an emotional win with his wife of 18 months, Miranda Lambert, for song of the year. But what makes Shelton, 36, a true star in her eyes? He's "very caring and loyal," Lambert tells PEOPLE.