Underwood was taken to hospital last night following a fall during training at Elstree studios.
He had been practising his new routine with professional dance partner Melanie Lambert when he tripped awkwardly on his ankle during a standard stopping manoeuvre.
The TV star had initially hoped it was just a strain but X-rays have revealed that the ankle is broken.
"After breaking his ankle last night, Michael Underwood can no longer compete in Dancing On Ice," said an ITV spokesperson.
"The whole team are sad to see Michael leave the competition in this way and wish him a speedy recovery."
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