Jennifer Lopez found something more enthralling on her smartphone than Mariah Carey's powerhouse performance at the 2015 Billboard Music Awards on Sunday.

Cameras caught Lopez scrolling through photos on her phone while Carey performed her new hit single, "Infinity." The "American Idol" kept her head down through most of the song and only put her phone away to chat with boyfriend Casper Smart.

To her defense, J. Lo did have her head bobbing to the music near the end of the performance and put some effort into her applause. Of course, she couldn't compete with Taylor Swift who was also in the front row and cheering a little more enthusiastically.

The two female artists both started in the entertainment industry in the early 1990s, but Lopez didn't transition to music until the late '90s. Carey already had produced six successful albums by then.