The 24-year-old British singer, who was the only artist to perform at the royal wedding, said that she looks to people with talent for her fashion influences.
In an interview with Cosmopolitan, she said, 'Everyday I'd say I look different. Sometimes I look really formal, sometimes I love the classic Stella McCartney, Chloe Sevigny and Gwyneth Paltrow thing. Other days I like being rock star and wearing leather jackets and studs,' she explained.
'I love wearing Burberry - it's the perfect combination of formal and punky. Because I divide my time between my house in Hammersmith - even though I'm never there - and [boyfriend] Greg [James's] flat I have clothes spaced out everywhere.'
She continued, 'I don't really have a style icon but I really admire the way people dress like Gaga, Rihanna and Gwen Stefani. It's good to be inspired by singers who write music and dress incredibly - rather than models and people in the fashion industry who dress immaculately anyway because it's their style,' she said.
'I really love the way Courtney Love dresses - she's got that grungy thing. Rihanna I love, she always looks cool. And she's hot, very hot.'