The Oscar-winning actress and Martin were first linked in August following Lawrence’s split with her then boyfriend, actor Nicholas Hoult.
“Jen (Jennifer) is the one who broke it off with Chris,” a source told people.com.
Following a few quiet date nights at Martin’s Malibu home, the romance seemed to move further into the spotlight Sep 19, when Lawrence attended Martin’s performance at the iHeartRadio music festival in Las Vegas.
A source says the couple was together as recently as Oct 21, following Martin’s friendly dinner with his former lover Gwyneth Paltrow.
Representatives for the stars haven’t responded to requests for comment.