''Who Do You Think You Are?' (Fri., 8 PM on NBC) is devoted to tracing the family tree of celebrities. The series has given us several surprises so far (including the fact that Matthew Broderick's ancestor was a World War I hero). But on the latest episode, Brooke Shields gets what may be the biggest shock of all: She's related to a king of France!

Watch the video after the jump.'Who Do You Think You Are?' (Fri., 8 PM on NBC) is devoted to tracing the family tree of celebrities. The series has given us several surprises so far (including the fact that Matthew Broderick's ancestor was a World War I hero). But on the latest episode, Brooke Shields gets what may be the biggest shock of all: She's related to a king of France!

And it gets better than that. Shields is related to more than one king. She's the descendant of King Henry IV, and is the cousin of King Louis XIV -- the "Sun King," who is considered to be one of the greatest rulers in European history. She's also related to King Louis IX, better known as "Saint Louis" -- a real saint. Wow. It's hard to beat that, ancestor-wise.