"She's perfect as far as I'm concerned," says country star Tim McGraw of his wife of eight years, Faith Hill. So, what's the secret to their long marriage? "I'm a man that lives in a house with four women," says McGraw, 37. "So probably the secret is to shut up." And Hill, 37, says her handsome husband – and father of Gracie, 7, Maggie, 6, and Audrey, 3 – is "my brick. He's my wall."