STEAMY ON SET BACKGRID
Gwyneth Paltrow and Timothée Chalamet were caught smooching on the street in the Big Apple ... but TC's girlfriend, Kylie Jenner, has nothing to be jealous about ... 'cause it was only for a movie.
Gwyneth and Timothée were filming Wednesday on the set of their new sports flick, "Marty Supreme," in NYC, where the actors were seen in the throes of passion during one scene.
Check out the video .