VIDEO : Here's why Kate Middleton Might Be Absent From The New Royal Family Doc

The royal family stars in a new documentary called "Queen of the World" premiering soon on ITV and HBO. Meghan Markle is present in the trailer for the documentary, while Kate Middleton is noticeably absent. According to People, Middleton was out on royal maternity leave for much of the filming. What happens in Buckingham Palace typically stays in Buckingham Palace, but that will all change with ITV's new two-part documentary "Queen of the World" premieres on September 25.