Former senior police officer Brian Paddick is to appear on ITV1 show I’m A Celebrity, Get Me Out Of Here.
He will be joined in the Australian outback along with Simon Webbe of boyband Blue, Page 3 model Nicola McClean and lesbian icon Martina Navratilova.
The show starts on Sunday.
Gay entertainer Christopher Biggins won the competition in 2007.
Mr Paddick, 50, a former Metropolitan police deputy assistant commissioner, was Liberal Democrat candidate for Mayor of London in May’s election. He lost to Tory Boris Johnson.
In September he announced in an article for the Mail On Sunday that he and his Norwegian boyfriend Petter Belsvik intend to get married early next year.
He was enthusiastic about a Norwegian wedding.
A change in the law there means that from January both gay and straight couples can get married.
Mr Paddick was the country’s most senior out gay officer until he retired in 2007.