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Casey Affleck, Puff Daddy, Joaquin Phoenix

Seth Browarnik/startraksphoto.com

Like big brother Ben before him, Casey Affleck is turning his talents to behind the camera, directing a documentary on close pal and brother-in-law Joaquin "Bye! Good" Phoenix.

The documentary will chronicle Phoenix's abrupt transition from an Oscar-nominated acting career to a burgeoning musical one.

While the amateur guitar-strummer and Johnny Cash channeler extraordinaire announced last spring that he would be cutting a more rock-centric album, word now is that Phoenix's debut will be as a rapper under the tutelage of none other than Diddy.

And no, despite appearances, you are not being Punk'd.

 

Affleck, who has directed a handful of shorts for the Sundance Channel, was on hand last November, when some of the first Phoenix footage was shot in Hollywood, however, it appears that may have just been a practice run.

Per the Hollywood Reporter, the shoot will officially kick off tonight in Las Vegas, when Phoenix makes his first public performance.