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LeBron James' second-oldest son is celebrating his Sweet Sixteen on Wednesday ... and the Los Angeles Lakers superstar made sure to wish Bryce a happy birthday with a special shout-out to the teen hooper.

"SCREAMING HAPPY 16th BIRTHDAY 🗣️🗣️🗣️🗣️🗣️🗣️🗣️🗣️ to my Twin MAXIMUS @_justbryce!!!!!!" Bron said on Instagram. "I LOVE YOU YOUNG 🤴🏾!!!"

"Keep going up and up and up! Love the young man you are and becoming every single day!! 🙏🏾🤎🤎🤎🤎🤎🤎👑."

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