Spike Lee -- Superfan Turns Traitor ... Parties with Miami Heat

Miami Heat parties are so ballin'... even their most hated enemies will bow down for a chance to hang with the champs -- just ask #1 Knicks fan Spike Lee!

LeBron James, Dwyane Wade, and Chris Bosh hosted a sick bash at Club Bamboo on South Beach Friday night -- with a ton of celeb guests.

Drake and Timbaland were there -- as well as actual Heat fan Flo Rida.

Spike famously sits courtside, covered in team gear, for almost every NY Knicks home game at Madison Square Garden -- especially when they're playing rivals like the Heat.

But we think Spike deserves a pass on this one though. His precious Knicks haven't won the title since Spike was 16 (in '73).