A US record executive was amazed by her voice and signed her up.
Joss - whose real last name is Stoker - comes from Ashill, near Cullompton. Her album is made up of cover versions of songs mainly from the 1970s Miami soul scene.
Her husky voice and willowy looks have led some music critics to say "she looks like Britney and sounds like Whitney".
Legendary music producer Nile Rodgers reckons she has the same "gift" as superstars Michael Jackson and Stevie Wonder.