Turns out not everyone knows Travis and Jason Kelce ... and actress Krysten Ritter is one of those people, 'cause the Celebrity Wheel Of Fortune contestant had NO IDEA who the famous bros were during a recent episode!
The "Jessica Jones" actress appeared on the long-running game show on Monday, alongside Sarah Levy from Schitt's Creek and designer Christian Siriano ... when they were confronted with the seemingly simple puzzle.
The category was "Family" ... and as the letters nearly filled the entire puzzle, it was clear Ritter wasn't hip to the NFL's most famous siblings.