Eilish and Del Rey performed two songs together during the 'Born To Die' singer's headlining set
The singer-songwriter's third album is due to arrive in May
Despite slow ticket sales, the California festival still dominated the music world this past weekend – for reasons both good and bad
The set came after the singer joined Lana Del Rey on stage for her Friday headline performance
Catch up on everything that happened at weekend one of this year’s festival
In previous years, booze was only allowed in certain areas
Lana Del Rey in particular struggled with microphone issues throughout her headlining set
Other guest performers included Jack Antonoff and Jon Batiste
The singer previously confirmed that the physical copies of her album will be made using 100 per cent recyclable materials
She also confirmed that she won’t be sharing any singles ahead of its release