WATCH: Jennifer Lopez Caught Using Her Phone During Mariah Carey’s Billboard Music Awards Performance

Booed at BBMAs
Kendall and Kylie Jenner are booed at the 2015 Billboard Music Awards.
BBMAs 2015 Arrivals
Find out who we spotted on the red carpet.

And the award for Best Shade Thrown during the 2015 Billboard Music Awards goes to Jennifer Lopez.

The “Booty” singer seemingly disrespected longtime rival Mariah Carey when the diva was on stage during Sunday night’s ceremony. While Carey, who had her first award show performance in 18 years this weekend, sang a medley “Infinity” and “Vision of Love,” behind-the-scenes cameras at the ceremony caught Lopez staring at her phone from her front row seats as she scrolled through what looked to be her Instagram feed.

It was only when the house light came up after Carey’s final bow that Lopez looked up and applauded with the rest of the crowd.

Fortunately for Jenny From the Block, that split second was exactly what broadcast cameras captured for TV. (And unfortunately for Kylie Jenner, the cameras also captured her uninterested face behind J.Lo.)

Of course, this was not the first shady move between the two music icons. Back in the day, Carey famously dragged Lopez when a reporter asked about the songstress, feigning ignorance by simply saying, “I don’t know her.”

There must be an eclipse over Las Vegas with the amount of shade these two are throwing at one another. Currently, both singers have residency deals in town.

Let the Shade War continue.