The ‘collaboration’ between the British singer and Vauxhall will coincide with her European tour in 2011.
Peter Hope, Vauxhall’s Marketing Director, said: "We are thrilled to be working with Katie. Vauxhall is all about being British, forward thinking and energetic, and we think Katie embodies these values perfectly.
"In addition, we are passionate about consistent environmental awareness and social responsibility; as a subject very close to Katie’s heart, it only makes the partnership more fitting."
Melua, who had hits with ‘The closest thing to crazy’ and ‘Nine million bicycles’, agreed to the deal because of Vauxhall’s environmental credentials, backed up by the extended range electric Ampera.
"I like the way Vauxhall addresses topics like environmental efficiency and sustainability and I feel very comfortable with the partnership; it’s a great fit," she said, after being photographed with the Ampera.
The Vauxhall Ampera will be released in the UK in 2012, and will offer 50 miles of completely electric driving, followed by a further 300 miles where the electric motor will be powered by a small petrol engine.
Unlike conventional hybrid cars, the Ampera’s petrol engine only recharges the battery instead of directly driving the wheels up to speeds of 70mph.
The car will accompany Melua on her tour of 50 European cities in 2011. It appeared at an event yesterday to announce the new partnership at Air Studios in London, where Melua performed live to mark the occasion.