Jennifer Lawrence, Chris Martin Romance Heats Up! 'Hunger Games' Star & Coldplay Singer PDA: Ex Gwyneth Paltrow Upset?

Jennifer Lawrence and Chris Martin may be an unlikely pair, but their romance is now heating up with various public displays of affection.

While backstage at a Kings of Leon concert at the Hollywood Bowl on Friday night, the Hunger Games actress was spotted watching her singer-boyfriend perform as a surprise guest, reports JustJared.com. The Grammy winner performed two songs at the piano:  "Talihina Sky" and "Notion."

The couple was even more affectionate earlier in the day at rehearsals.

"Jen was taking photos and videos of Chris during rehearsals on her phone," a source told JustJared.com. "They engaged playfully with each other, appearing like a couple in love. She kissed him on the lips several times."

Jennifer and Chris were seen together last month at the iHeartRadio Music Festival in Las Vegas. She was there to support her man who was performing with his band Coldplay.

The Oscar winner also showed up to watch Coldplay perform at the Ace Hotel Theatre in Los Angeles in September, E! News reported. Jennifer looked head-over-heels while watching her man perform.

"She danced the entire time," a source told E!. "She knew every word to every song and there was a glisten in her eye as she watched Chris perform. She couldn't take her eyes off him."

Jennifer and Chris have been dating for months. The frontman earlier this year announced a separation from his wife of 10 years, Gwyneth Paltrow, while the X-Men: First Class actress split up with her actor-boyfriend Nicholas Hoult.

According to Radar Online, the feeling of love is mutual with Chris wanting to take the next step with Jennifer.

"He sees this relationship going the distance," a source revealed to Radar Online. "Gwyneth was absolutely stunned when Chris told her he wants to introduce the kids to Jennifer."

What do you think of the relationship? Do you think it will last?