London: Singer Rita Ora made a surprise appearance at the Wireless Festival here alongside hip-hop duo Krept & Konan.

The "I will never let you down" hitmaker shocked fans when she joined Krept & Konan on stage to perform their hit single "Freak of the week", reports femalefirst.co.uk.

The 25-year-old singer kept her performance so quiet that no one even knew she was backstage waiting to enthral the crowds at the festival. 

Meanwhile, the singer sparked speculation she is dating Formula One champion Lewis Hamilton after video footage of them on a holiday emerged.