The 37-year-old Coldplay frontman was a surprise guest performer at the rock band's concert, where he sang and played piano on two songs - "Talihina Sky" and "Notion."
A source told E! News that Lawrence was taking photos of her alleged new beau and seemed to have enjoyed the entire concert.
"Jen was taking photos and videos of Chris during rehearsals on her phone," the tipster told the entertainment and celebrity news site. "They engaged playfully with each other, appearing like a couple in love. She kissed him on the lips several times."
This is not the first time the Oscar-winning actress was spotted at Martin's gig. She attended a Coldplay concert in Los Angeles in September, and was also present at the 2014 iHeartRadio Music Festival in Las Vegas later that month to watch him perform.
The rumored couple were also reportedly spotted "making out" at the said music festival.
"At around 7:00 p.m. on Friday(Sept. 19) night, Jennifer and Chris were making out backstage in an area that only allows security and a select group of celebrities in," an eyewitness source close to the production of the event told Radar Online, as quoted by The Mirror. "She had her arms around his neck. They were kissing passionately before he took the stage!"
And when the Martin hit the stage to perform, "Jennifer was watching from backstage and looked like the proudest girlfriend in the world!" added the tipster.
A recent report by People claimed that the relationship between the two are getting deeper.
"It seems they are definitely getting more serious," a tipster close to the new couple said. "Whenever Chris is not spending time with Apple and Moses at his Malibu, [California], house, Jen is there."
"Chris and Jen always time it so that after Gwyneth [Paltrow] picks up the kids (Apple 10, and Moses, 8), Jen will arrive in Malibu minutes after," added the source.
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