D'Angelo Russell's GF: I Got Hops, Too ... Watch Me Get Up

Forget the NBA, Lakers rookie sensation D'Angelo Russell might not be the best athlete in his OWN RELATIONSHIP ... 'cause his GF is showing the world she has some serious lift.

Russell is dating USC volleyball player Niki Withers who must've wanted to prove to him she knows her way around the basketball court ... 'cause check out this clip of NW grabbing the rim with authority.

It's pretty impressive video -- Withers is 5'10" (and the sister of Jaguars TE Marcedes Lewis) and glides up to the cup with ease.

We would say she should try out with the Sparks ... but let's face it ... the Lakers need more help.