NFL Star Prince Amukamara -- I'M A TMZ PAP NOW ... And I Just Shot a Huge NBA Star!!!

NY Giants cornerback Prince Amukamara isn't just a rising superstar in the NFL -- dude's got serious PAP SKILLS ... and this week, he grabbed our camera and went to work.

Good news -- THE GUY'S A NATURAL!!!

Right off the bat, he shot San Antonio Spurs superstar Danny Green outside an ESPY party in Hollywood ... and challenged him with a great question: Can you name 3 NY Giants players?!

Now, here's the mystery we're debating in the office ... do you think Green knew the guy holding the camera is a G-Man??