The Duke of Cambridge has thrown his support behind a homelessness charity to mark his milestone 40th birthday. <br /> <br />Prince William posed for the front cover of a special edition of The Big Issue. <br /> <br />William also wrote exclusively for the magazine about why he wanted to shine a spotlight on homelessness. Report by Chanda. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn
