Amy Grant has been released from the hospital following a bike accident in Nashville, and she's now back home resting comfortably.The singer's verified Instagram account released a statement Friday with an update on her health, which included that, due to doctor's orders, she'll have to postpone several of her upcoming Tennessee shows in Knoxville (at the Tennessee Center), Chattanooga (at the Robert Kirk Walker Theatre) and Johnson City (at Martin Center for the Arts). Those shows were scheduled for Aug.