FOX has just signed another judge in what could be the breakout music competition show next year -- 'The Four.'
TMZ broke the story, the program -- with an emphasis on hip-hop artists -- showcases 4 awesome contestants who have to maintain their seats as challengers come in and try and knock them off.
There are 4 judges -- a business mogul with music ties, a music producer, a record exec and a big-time performer, who will pick a winner and then team up to launch that person's career.
We've learned Diddy is the mogul and DJ Khaled is the producer. The third judge has just been offered a spot -- Charlie Walk -- a music industry exec who has worked with The Weeknd, Ariana Grande and Hailee Steinfeld ... just to name a few.
The show will air in January.