Ant and Dec opened the Britain's Got Talent live semi-finals on Bank Holiday Monday evening in style, with a music hall-inspired song that began outside the theatre – and ended in front of the judges with a revelation about one of them from the hosts.

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"Alesha's expecting," sang the boys as the number ended, before wishing her "congratulations!".

And judge Alesha Dixon confirmed that she is indeed expecting her second child with her husband – but not before David Walliams had claimed that he was the father.

"We’re very, very happy," said Walliams. "These things happen when you're on the tour."

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Alesha told Ant and Dec that revealing it on BGT was "a lovely way to celebrate" the good news.

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