LeBron James -- Happy Birthday Mom ... HERE'S A PORSCHE!!

LeBron James channeled Oprah Winfrey for his mom's birthday gift ... 'cause SHE GOT A BRAND NEW CAR!!!!!!!

LeBron just surprised his mom with a white Porsche Panamera ... which can run up to $200k.

And if that wasn't enough, the NBA superstar included the following heart-felt message:

"Enjoy and love you momma! Trying to figure out how to give u the world but in the mean time enjoy your new toy! #ProudSon #SheGoneStuntOnMeNow #StriveForGreatness"

As for LeBron's dad -- well, he got something else this week ... a public "thank you" note from 'Bron for not being in his life.

"I have no idea who you are, but because of you is part of the reason who I am today."

Yeah, mom's gift was better.