The two A-listers began dating in June, but new reports suggest it was Jennifer who ended their romance.
"Jen is the one who broke it off with Chris," a source revealed to People.
Although they were only photographed together once during their short romance, the pair appeared very much an item when the actress was spotted attending two Coldplay concerts in the space of three days.
The 24-year-old Oscar winner was most recently pictured backstage at the 2014 iHeartRadio Music Festival in Las Vegas, where Chris and his band were performing.
While Jennifer and Chris, 37, never confirmed their romance, the official Twitter account of iHeartRadio seemed to hint that the pair were going strong. "SPOTTED #JenniferLawrence Backstage! Wonder who she's here to see? *Cough New b/f #ChrisMartin Cough* http://ow.ly/BIaVz #iHeartRadio," a post read.
Chris and his ex-wife Gwyneth Paltrow announced their shock split in March but the two had continued to spend time together, with the estranged couple spotted holidaying together in the Hamptons in September, with their two children, Apple and Moses.
Jennifer and her long-term boyfriend Nicholas Hoult ended their relationship in June.
Earlier this month Jennifer revealed to Vanity Fair what she looks for in a man.
"Basically, what I'm saying is all I need in a relationship is somebody to watch TV with me," the Keeping Up With the Kardashians fan said.
She also admitted that she's not looking for a passionate love but someone with whom she can "have a peaceful time. [Those] are deeper because you can be your true self with somebody, and somebody can be their true self with you."