LeBron James may not be the richest guy floating off the Amalfi Coast right now ... because Jimmy Iovine just showed up!
The music mogul was spotted on a yacht with LeBron on the 4th of July -- as the NBA star continues to celebrate his new $154 million Lakers contract.
Unclear if LeBron is on Jimmy's yacht ... or if Jimmy is on LeBron's yacht -- but one thing is for sure ... they can both afford some sick boats!
By the way, the have a Beats By Dre connection -- Jimmy (who co-founded the company with Dr.