Rob Pattinson -- REBOUNDING WITH NEW CHICK ... Possibly

Screw Kristen Stewart ... ROB PATTINSON HAS A NEW GIRLFRIEND -- at least that's one possible explanation for photos that just surfaced ... showing the "Twilight" actor chatting up a hot chick at a bar.

The photos were snapped Saturday night at the Electric Room bar in NYC -- and according to sources inside the establishment, Rob cozied up with the mystery blonde for hours ... even putting his arm around her at one point.

There are reports Rob and Kristen have reconciled following her cheating scandal earlier this year with "Snow White and The Huntsman" director Rupert Sanders -- but these photos might be the smoking gun that proves otherwise!!!!