The 21-year-old from London gained a large fan base with the release of her single 'Breathe' last month, but has also collaborated with Chase & Status and Wrench 32.
"I'll be going to festivals every weekend now," she said before hitting the main stage.
Currently, on a whirlwind promotional tour ahead of releasing her debut album, 'From The Roots Up' next month, she added: "I really enjoy festivals and there are lots of cool acts here at OsFest.
"I'm sorry about the weather, but I'm sure the crowd are up for it."
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