Michael Jackson’s 13th and final No. 1 hit in the US during his lifetime was 1995’s “You Are Not Alone,” penned by R&B star R. Kelly. It holds the distinction of being the first song to debut at the top of the Billboard Hot 100 chart, but its lyrics may hide a dark secret. In the premiere of Lifetime’s 'Surviving R. Kelly' documentary on Thursday night, a woman named Lizzette Martinez revealed that Kelly wrote the song about their abusive relationship when she was just a teenager.