Justin Bieber -- NBA PAL MAKES ALL-STAR TEAM ... Thanks to Pop Star's Support

Maybe he really IS the most powerful man in the NBA ... because Justin Bieber's pal Kyle Lowry has been voted to be a starter in the NBA All-Star game ... and it seems Bieb's support put him over the top.

As we previously reported, Lowry was 3rd in All-Star voting for the Eastern Conference backcourt position behind Dwyane Wade and John Wall ... that is, until Bieber tweeted to his 60 MILLION followers to vote for the Toronto Raptors star.

Well, Bieber's plan worked ... with Lowry surging ahead in the voting at the last minute to secure a starting spot ... beating out Wade by 15,000 votes.