Katharine McPhee and Meghan, Duchess of Sussex

Former 'Smash' star and musical theatre actress Katharine McPhee was actually in middle school when Meghan, Duchess of Sussex - who was known as Meghan Markle before marrying Prince Harry and becoming part of the British Royal Family - was in high school but her older sister was in Meghan's class and Kat would star in amateur musicals with the future royal. She said: "I went to school with Meghan Markle. I was in middle school when she was in high school.I did a couple of shows with her but I was younger and wasn't allowed to be in the more major roles with shows, I did musicals with her."