Celebs Pour Into Crypto.Com Arena To Watch LeBron, Lakers' Thrilling Win

Tons of celebrities made sure they were in attendance for the Lakers' play-in game Tuesday night ... and they no doubt were glad they came -- 'cause L.A. won in an instant classic!!

Tennis legend John McEnroe had courtside seats for the playoff-clinching game with the Timberwolves at Crypto.com Arena -- as did Michael B. Jordan, Jimmy Iovine and Corey Gamble.

All were treated to a helluva contest ... as L.A. and Minnesota went back and forth for about three hours -- before LeBron James' squad came out on top in overtime, 108-102.

It took a herculean effort from the Lakers superstar to get his team the victory -- the 38-year-old led all scorers with 30 points ... and was a huge reason L.A. came back from down 15 to secure its spot in the playoffs.

The win was massive for Bron's team ... if they had lost -- they would have had to play the winner of Wednesday's Oklahoma City vs. New Orleans matchup in what would have been a do-or-die game for the last spot in the playoffs.

Now, however, they're safely in ... and will play a series against the Memphis Grizzlies to try to continue their advance in the postseason.

Other celebs in attendance for the big L.A. win included Al Michaels -- who looked super chipper outside the arena before the game began.

Film producer Jeffrey Katzenberg, singer Rosalia and comedian Sebastian Maniscalco were all there as well.