On Sunday night, the pop star, 25, delivered her first of two headlining sets at the annual music festival in Indio, California.
ABC7 Los Angeles reported that witnesses saw public showers engulfed in flames after hearing a loud boom similar to an explosion.
Authorities have provided no details on what might have ignited the fire.
The county fire department, promptly on the scene, explained what happened on a Twitter post. Along with that, no concertgoers suffered any injuries.
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The Coachella fire occurred near the center of the Empire Polo Club grounds venue, at a mobile shower unit.
One trailer was damaged, while a second was destroyed, they said.
The fire department said the blaze had been contained as of 2:28 a.m. "Fire crews will remain on scene for one hour for overhaul", it added.
Don't fret if you couldn't fork over a pile of Benjamins to gain access to the Coachella Festival this weekend. The live feed will resume Saturday at 4:15 p.m. with music from Weezer, Billie Eilish, Tame Impala, Bassnectar and others.