Justin Bieber & Rick Rubin Are 'Making History' Together: What Does This Mean?

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Justin Bieber attends the Grand Opening of West Coast Customs Burbank Headquarters at West Coast Customs on Dec. 7, 2014 in Burbank, California.

This one of the signs of the Apocalypse, right?

Def Jam co-founder and music legend Rick Rubin -- who has produced classics for everyone from Jay Z to Slayer to Johnny Cash to Run-D.M.C. -- is working on something with Justin Bieber.

The Revelations-esque revelation comes via Scooter Braun's Instagram. Bieber's manager posted a pic of the two leaning into each other with the caption, "Working on some history!"

Given that Justin Bieber is a singer and Rick Rubin is a producer, it's probably a good bet the work Braun alludes to is studio time.

Bieber fans are clearly very excited about the pairing, referring to the game-changing prodcuer as "Santa" and "Dumbledore" in the comments. So, time to get ready for Bieber's version of Reign in Blood, right?