Researchers at Ancestry.com traced Kate and the Fanning sisters' roots back seven centuries and found the trio are all descendants of King Edward III who ruled England from 1327 to 1377.
However, this isn't the first time Duchess Kate has been dubiously linked to other famous faces in the US. Back in 2011, rumour had it she was a descendant of the first American president George Washington, which subsequently linked her to chat show host Ellen DeGeneres.
On top of this, she's also related to Madonna's ex husband Guy Ritchie.
If we did enough digging we're sure we'd discover we too are distantly related to Kate... Or is that just wishful thinking?
The totally random news comes as a German newspaper decided to publish pics of the young royal's bare bum online - a decision which saw the entire internet up in arms, and left many wondering why Kate would wear such tiny knickers with such a billowy skirt.