LeBron James simply cannot believe his oldest son, Bronny, is just one year from becoming an adult ... wishing the young hoops star the happiest of birthdays and wondering, "What in the hell is going on. How are you 17??"
The Sierra Canyon baller is celebrating his birthday on Wednesday ... and King James honored him with a special tribute.
"My baby boy! Ight enough of soft ud83dudca9ud83dudca9. ud83eudd23ud83eudd23," James said on Instagram. "Proud of you Young ud83eudd34ud83cudffe.
"Watching you grow into the young man you are today makes me so happy and proud!