With Nick Young getting ready to tie the knot to fiancee Keonna Green -- our guy asked an interesting question ... does D'Angelo Russell get an invite to the wedding?!

Nick's response??? "HAHAHAHA!!!"

Look, in a way ... D'Lo is responsible for Nick's upcoming marriage -- because had he not posted that infamous video back in the day, Iggy Azalea and Nick might still be together!

It was messy at the time, but things seemed to have worked out for everybody since.

Nick's happily engaged (that went down over the Christmas break).