Dre and Jimmy created the brand back in 2008 with headphones -- but now they're also making bank off speakers, car audio systems, and a streaming service.
The deal could close next week ... and would be Apple's biggest acquisition ever.
Dre came in #2 on Forbes' most recent list of hip hop's wealthiest artists -- with a net worth of $550 million ... while Diddy was #1 at $700 million.
The Apple deal -- first reported by Variety -- could easily push the Doc to the top of that list. This would also explain his purchase of Tom Brady's mansion.
Keep their heads ringing.