Did you know -- Barack Obama had some of the greatest NBA players EVER over at the White House for an insane game of basketball for his 49th birthday??
It's true -- Kobe Bryant, LeBron James, Magic Johnson and Carmelo Anthony hit up 1600 Penn for a pickup game with POTUS in 2010 ... and now, a signed ball from the iconic day is hitting the auction block!!
Of course, Barry O is an avid hoops fan .