It's been YEARS in the making ... rap star Post Malone finally got to meet Allen Iverson -- while playing his smash hit "White Iverson."
A.I. really came to life during the lyric, "F*ck practice."
The two met up during a night out in L.A. -- judging by the video, the two had been partying pretty hard before the song played.
Post had been DREAMING about meeting the NBA superstar for a while -- and previously told TMZ Sports how much he loved the guy.
Congrats Post ... dreams do come true (especially when you're rich and famous!)
Waiting for your permission to load the comments.