It's hard to imagine tough-as-nails country gal Miranda Lambert getting so sick that she has to cancel shows, but unfortunately, that's exactly what has happened this week. The normally energetic country star was slated to play at Jam in the Valley in Varysburg, N.Y. tonight (July 6), but according to Jam in the Valley officials, the 'Over You' hitmaker "has taken ill and has canceled all performances for this weekend as per her doctor's orders."

"Due to overextending her voice, Miranda Lambert has been placed on vocal rest," the 'Over You' singer's publicist told the Boot. "She's under the care of her doctor and she hopes to return to the road next weekend."

A hiatus will surely be tough for Lambert, who never likes to let her fans down. Lambert was supposed to head to Scranton, Pa. after Jam in the Valley to play for a jam-packed crowd at the Toyota Pavilion at Montage Mountain. According to Toyota Pavilion's Facebook page, that event has been postponed as well.

Despite the short notice of Lambert's illness, Jam in the Valley organizers were able to snag Gretchen Wilson and Sawyer Brown to fill in for the last-minute cancellation. Organizers don't have a strategy for reimbursing disappointed fans of the award-winning songstress just yet, but they ask that all ticketholders hang on to unused tickets and wristbands until they come up with a plan.

Our warm thoughts are with Lambert (and her husband Blake Shelton) as the popular country star tries to rest up and get back on her feet. For more information about Lambert's summer tour, click here.