A super team of celebs showed up for LeBron James' big night -- with the NBA superstar hosting a bash to celebrate "Space Jam: A New Legacy."
King James showed up at Six Flags Magic Mountain Tuesday night for the huge event ... with names like Don Cheadle (who stars in SJ2), G-Eazy, Tiffany Haddish, MGK, Megan Fox and Olivia Rodrigo coming through to party.
Of course, the flick is set to release on July 16 after YEARS of hype .