In a pic posted on social media, the two were spotted at an L.A. sushi restaurant on Tuesday.
An eyewitness told People.com, "They were engulfed in their little world of conversation. They were into each other and not noticing anyone else around them. They seemed to be just content with each other," added the source. "He was really listening to what she was saying."
Martin, 37, and Lawrence, 24, had a brief romance earlier this year after Martin “consciously separated" from wife Gwyneth Paltrow.
By late October, however, Lawrence reportedly broke up with the Coldplay frontman because she “it was hard for her to understand the feelings between Chris and Gwyneth," a separate source said at the time.
Paltrow recently opened up to Harper's Bazaar UK about her relationship with Martin following their split. "We've made a lot of mistakes, and we've had good days and bad days, but I have to say, I'm proud of us for working through so much stuff together – and not blaming and shaming.”