Martin 'sings to Lawrence at gig'
The Coldplay frontman - who split from wife Gwyneth Paltrow earlier this year - was on stage with his band in Los Angeles and the actress was in the crowd.
Us Weekly reported that Jennifer, 24, arrived with friends and that Chris, 37, seemed to be looking for her, then when he performed he couldn't take his eyes off his rumoured new girlfriend.
"Just before the show was supposed to start, Jennifer Lawrence walked toward the stage, surrounded by a couple girlfriends, trying to find their seat," a source said.
"They looked a little rushed, like they wanted to get to their seat before the show started so someone on the theatre staff helped them out."
The insider continued: "Chris gave a good look around the room and then spotted someone up on the balcony. He pointed and said 'Aha! I see you!' and then smiled and waved. He kept looking up in the direction during the show and smiling, pointing, singing to her."
A source told E! News that Hunger Games star Jen "danced the entire time" and "knew every word to every song".
"She couldn't take her eyes off him," they added.
"Jennifer stared adoringly at Chris, both hands in the hair, dancing and singing along to Magic," continued the insider.
After the show the Oscar-winner left through a back exit and appeared to be trying to go incognito, holding her handbag over her face as she was led towards her car.
Chris and Jennifer have been romantically linked since August, when Jennifer was spotted attending one of the singer's US shows.