British singer Adele, 23, has been forced to cancel her American tour. The singer is suffering from a throat infection and needs to rest. Five shows had already been cancelled, but now the remaining nine concerts also won't take place. Last Saturday Adele performed in Denver, but the next day her throat infection was back with a vengeance, leaving her with no other option then to listen to her doctors and take more rest. If and when the concerts will be rescheduled is not known yet.