The 40-year-old ex-NBA star popped the question to 32-year-old his girlfriend, Sabrina Parr, with a MASSIVE diamond ring ... and she said, "Yes!"
Parr is a health and life coach -- and we first saw them together back in August when they hit up Chipotle for a lunch date in Atlanta.
Things escalated quickly ... and 3 months later, they're engaged!
There were reports the relationship was "fake" when they first got together -- but doesn't seem so fake now, does it?