Meghan Markle and Prince Harry are ready to tell their side of the story when it comes to their shocking decision to step down as senior members of the royal family, royal expert Katie Nicholl tells ET.ET spoke to Nicholl on Tuesday, after 39-year-old Meghan and 36-year-old Harry shared that they're expecting their second child together and after it was announced that they would be sitting down for an interview with Oprah Winfrey.