update

3:54 PM PT -- LeBron had one final gift for Kai … a haircut. He shaved off his signature braids.

Kai Cenat saved the best celebrity guest for last for "Mafiathon 3" ... landing none other than LeBron James to make an appearance -- and the future Hall of Famer came bearing gifts!!

The Los Angeles Lakers superstar and his daughter, Zhuri , pulled up to Cenat's livestream on Tuesday ... in the final hours of his 24/7 broadcast that's been going on for 30 days.

Cenat and LBJ chopped it up for the chat ... and outta nowhere, James surprised Kai with a Lakers-colored Audemars Piguet watch!!

Cenat was speechless as James explained it was for hitting a historic amount of followers on the platform. Play video content

LeBron also hooked Kai and his crew up with the new unr

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