After word broke that Apple was close to finalizing a deal to buy Beats for $3.2 billion, Dre went to the studio with Tyrese, F. Gary Gray (big-time movie director) and some friends and got turnt all the way up with lots of champagne, Heineken and Hennessy.
At one point, Dre looked into the camera and said -- "The first billionaire in hip hop ... right here from, the mother f**king West Coast!!"
Tyrese added, "Oh s**t, the Forbes list just changed!"
Sources at the studio tell us the gang partied until 4 AM.
Unfortunately for Dre ... he can't buy his way out of a hangover -- but having a BILLION DOLLARS sure makes you feel better when you wake up.