David Letterman and Joaquin PhoenixJoaquin Phoenix wasn't the only person to dupe 'Late Show' viewers during his infamous appearance last year. No, it now appears David Letterman was in on the ruse the entire time.

The Hollywood Reporter dug up an interview from last year with one of Letterman's writers, Bill Scheft, claiming Letterman was in on the bearded Phoenix joke all along, and faked the famous interview on live television.

"Dave knew about it and Dave loved it because he could play along," Scheft said in the interview with independent newspaper Nuvo that was dug up on Friday after Affleck called off the act.