The two men were convicted of hatching a plot to rob and kill Joss Stone. 32-year-old Junior Bradshaw and 35-year-old Kevin Liverpool harboured deep hatred for the soul singer.
The men from Longsight in Manchester denied charges of conspiracy to murder, the alternative charges of conspiracy to cause grievous bodily harm and conspiracy to rob.
The jury found Bradshaw and Liverpool guilty of conspiracy to murder and conspiracy to rob after a three-week trial at Exeter Crown Court.
More top news
Mist and fog will affect parts of the Midlands and Eastern England tonight.
A plan to secure the future of Port Talbot steelworks in south Wales will be unveiled to staff on Wednesday.
A National Audit Office report shows that since 2009 the amount of tax paid by the super-rich appears to have fallen by £900 million.