Britney Spears revealed that she had an abortion back when she was in her high-profile relationship with Justin Timberlake. According to 'People' Magazine, the pop superstar opened up about the decision in her new memoir, 'The Woman in Me'. The duo, who were together for three years, began dating in 1999 when Spears was 17 and Timberlake was 18. Spears says that her decision to have the abortion was because Timberlake didn't want to go through with the pregnancy.