Katherine Jenkins injured during Dancing With The Stars

The classical singer stumbled over the final steps of her performance during the semi-finals show after she felt an agonising pain along her spine.

Jenkins covered her face with her hands and struggled to walk as her partner Mark Ballas tried to soothe her, while the judges gave the pair their scores.

Backstage, the tearful Welsh star explained, "I just felt my back go as I bent back. I'm so sorry if I've let you down, Mark."

After visiting a medic, she took to Twitter.com to tell fans, "Thank you for all your concerned tweets... I'm with the doctor, he says it was a reflectorical spasm in my lower back."

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