The country star announced earlier this month she was pulling out of a string of gigs on doctor's orders.
She expressed her hope to return to the stage for concerts later this week, but Lambert has now told fans she will not be performing as planned in Alabama and Georgia as she needs more vocal rest.
In a statement, she writes, "I'm so sorry to disappoint the fans that have already bought tickets to see me. I'm taking care of my voice and I can't wait to get on the road again and bring you a hell of a show."
The gigs will now take place in October.
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