Mariah Carey One of the most anticipated celebrity births of 2011, 42-year-old Mariah Carey gave birth to twins Moroccan and Monroe in April that year. About trying for a successful pregnancy after a miscarriage, Mariah said: "The main thing I did that was tough, was to go on progesterone like every month . . . and then when I was pregnant, I had to stay with the progesterone for 10 weeks. It minimizes the chance of miscarriage by 50 percent." Image Source: Getty