But the 'Nasty' singer revealed her darker side when she changed into a slinky black backless maxi dress with a risque plunging neckline, for the after party at London's swanky Arts Club.
Blonde Pixie, 23, accessorised the simple but sexy black maxi dress with a pair of pointed red satin heels and matching mini handbag.
And she completed her transformation with that age-old trick: a glossy red pout (perfectly matched to her shoes and her handbag - obvs).
Et voila - after party ready, Pixie-style!
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All the Brits fashion in our gallery below:
Copyright: WENN Lia Toby