James Harden with the ultimate birthday assist ... because he just hooked up rapper Lil Baby with an insane $300,000 gift bag!!!!
Lil Baby turned 26 this week -- and to celebrate, his good pal, James, turned up with a designer Prada bag loaded with goodies.
"Prada bag 'cause he Prouda' me," Baby said of Harden's gift.
Inside, a bunch of honey bun pastries -- surrounded by a "honey bun," which is slang for $100,000 IN CASH!!!!
(Get it, honey bun -- like a bundle of hundreds?)
There's more .