The Bad Guy singer suffered a tumble after tripping on some fire safety equipment.
The 20-year-old Oscar winner played an explosive set that involved the use of a crane as she sang hit Ocean Eyes, seeing her raised 20ft into the air to hover over the crowd.
There was a duet with her brother and co-writer Finneas and a compilation of home videos, while she also brought out Paramore singer Hayley Williams as a surprise guest to perform a rendition of Misery Business.of Gloria Gaynor’s I Will Survive and his One Direction hit What Makes You Beautiful.
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