Russell Westbrook had the best Tuesday EVER -- because after he scored a $47 MILLION payday from the Lakers ... he celebrated with Kevin Hart at an L.A. hotspot!!
Russ opted into the final year of his Lakers contract early Tuesday morning -- making him richer than ever -- and hours later, he, Hart and some other buddies grabbed dinner at LAVO Ristorante, a swanky West Hollywood joint.
The two were in great spirits -- laughing and dappin' each other up outside of the eatery ... and while Russ didn't say too much, it's pretty clear he's fired up to be staying in L.