While the famed songstress was on stage singing "Infinity," J.Lo was caught on video in the audience looking like she had better things to do, scrolling through her phone in the front row during nearly the entire performance, according to TMZ.
Once Mariah finished up, the audience applauded as she beamed on stage. While J.Lo finally put down her phone at that point, let's just say her applause wasn't that enthusiastic. Peep the look she was caught giving on camera in the video below.
Rumors have floated around for years that Mariah and J.Lo have been involved in a years-long feud, but the American Idol judge shut that chatter down when she appeared on Watch What Happens Live! last June.
"I don't have a feud against her at all," the "Booty" crooner told Andy Cohen at the time. "I know from back in the day, I've read things that she's said about me that were not the greatest, but we have never met. Like, we don't know each other. I think it's kind of from word of mouth of things that have happened in the past that I'm not really aware of. But I don't know."
"I would love to meet her and I would love to be friends with her," she continued. "I think she's incredibly talented and I've always been a fan of hers. 'My All' is one of my favorite songs of all time. I just love her. It saddens me to hear anything that's negative because I'm a fan of hers."
Feud or no feud, there's no denying J.Lo wasn't exactly moved during that performance...and neither was Kylie Jenner...who was caught on her phone right behind her.
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Gallery | 2015 Billboard Music Awards Red Carpet Arrivals