Surprised pupils were delighted to see Jermain Jackman from BBC's The Voice pop in to their school.
Jermain, who won the third series, performed to students at the King's Lynn Academy.
His young audience was captivated as he sung Louder Than Words from his forthcoming self-titled album which is out March 23.
An ambassador for the National Citizen Service (NCS), Jermain told the pupils that he took part in the scheme in London four years ago.
The College of West Anglia in Lynn, also now runs the programme which is open to all 16 and 17 year olds.
Speaking before his performance, Jermain said: 'The NCS gave me challenges I overcame, such as my fear of deep water and other skills.
'The hard thing was I didn't know what I wanted to do at school - I had so much passion for so many things. I love politics and representing young people. It's about empowering young people to change their community.'
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