Lebron James and Macklemore -- Bromance Blossoming

The bromance between LeBron James and Macklemore is continuing to grow -- with the rapper and the NBA star hanging out on the floor of a Heat game earlier this week.

The two were first seen together on November 5 -- when Macklemore was a special guest at a Heat vs. Raptors game. Apparently, the two hit it off and have been friends ever since.

In fact, James tweeted a pic of the rapper at the American Airlines Arena on Sunday (11/24) holding a pair of LeBron's Nike sneaks with the caption, "#KickGameSerious #Music+Sports #BestRelationshipThereIs"

But the following day (11/25), the two hung out again ... smiling and posing for pics on the floor of the Heat game like BFFs.

It's just Lance Armstrong and Matthew McConaughey ... only without the shirtless jogging, the PEDs, and the adultery with Sheryl Crow.