By Charlotte McIntyre BBC viewers were left teary-eyed during Saturday’s episode of Michael McIntyre’s Big Show when a surprise guest made an appearance. Country singer LeAnn Rimes took to the stage and wowed audiences with her hit song How Do I Live. The unexpected star of the show was Sarah, a mum-of-two from Yorkshire who loves to sing. However, in 2012, her life was turned upside down when she was diagnosed with a brain tumour and had to undergo emergency surgery. Despite her recovery, she has continued to suffer from seizures and had to learn how to speak again. During tonight’s episode s…