Prince Harry and Meghan Markle are keeping it simple this holiday season.This will be the Duke and Duchess of Sussex's first Christmas since stepping down as senior members of the royal family earlier this year, and moving into their new home in Montecito, California, just a few months ago. «The couple will be spending Christmas at home in California quietly with Archie and Doria [Ragland] joining them,» a source tells ET of the couple's low-key holiday plans with their 1-year-old son and