Simon Cowell has showed off his incredible four stone weight loss as he stepped out for a winter stroll in London.The 61 year old, whose parenting skills were recently slammed by Paddy McGuinness after he admitted he "never changed a nappy", was photographed walking in the snow with pal and talent manager Jonathan Shalit on 9 February.The TV personality appeared to wrap up warm for the outing as he wore a black top with a giant black padded coat and a grey scarf around his neck.