Junior Bradshaw will be sentenced at a later date, pending medical reports.
Kevin Liverpool has been given a life sentence with a minimum term of 10 years and 8 months for conspiracy to murder and rob Joss Stone.
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.
Joss Stone, wearing a white silk shirt and black skirt, is asked about being invited to the wedding of Prince William and Catherine Middleton.
She confirms that she attended the wedding because she had performed for them in the past.
A jury has found Kevin Liverpool and Junior Bradshaw guilty of conspiring to murder and rob singer Joss Stone from Devon.
The jury has been sent out in the trial of Kevin Liverpool and Junior Bradshaw, accused of conspiracy to murder Joss Stone.
The judge in the trial of Kevin Liverpool and Junior Bradshaw, accused of conspiracy to murder Joss Stone, has resumed his summing up at Exeter Crown Court.
Joss Stone's mother is in the public gallery - she has been at court everyday.
The jury in the trial of two men accused of plotting to kill the singer Joss Stone have heard for the first time the defence being put forward for one of them.
After a three week court hearing, the prosecution and defence are starting to make their final statements at Exeter Crown Court. Both men deny the charges.
More psychiatric evidence is expected to be heard in the trial of two men accused of plotting to kill Joss Stone. Junior Bradshaw and Kevin Liverpool were arrested last June a few miles from the singer's home near Cullompton in Devon.
The trial at Exeter Crown Court is expected to finish next week.
One of the two men accused of conspiring to rob and kill the singer Joss Stone claims he had never heard of the singer before his arrest. 32-year-old Junior Bradshaw denied asking a postman for directions to the singer's house shortly before they were arrested.