Although it's an empowering song, Miley Cyrus says her hit "Flowers" was one of the saddest songs she's ever written.  The singer said, "There is a difference in having outside love from someone else. There is a different feeling of buying flowers for yourself and receiving them from someone that cares about you. There is. And then, the celebration that I guess I had never even thought about it that way. I had never thought so many of the things that we're looking for in a relationship we actually can just bring to ourselves, but first you gotta have a healthy relationship with yourself. You gotta love being you." She continued, "That's why it's kind of one of the sadder, I think it's one of the sadder songs that I've actually ever written." What has been one of the saddest parts of your life?