After more than two-decades of marriage, Tim McGraw and Faith Hill continue to put their love on display. Yesterday, in honor of Hill's 50th birthday, McGraw shared a heartfelt message to her on social media. He wrote, "Happy birthday to the most beautiful girl in the world. You are the most remarkable person that has ever been in my life. Our daughters could not have a better role model. I am truly in love with you more everyday." He added, "Can't wait to see what 'the rest of our life' has in store for us," referencing their rumored new single, "Rest of Our Life."