Andrew Ridgeley (left) and George Michael of Wham! performing during the pop duo's 1985 world tour, January 1985. In the background are backing singers Pepsi and Shirley - Helen DeMacque (left) and Shirlie Holliman. 'The Big Tour' took in the UK, Japan, Australia, China and the US. (Photo by Michael Putland/Getty Images)

Andrew Ridgeley (left) and George Michael of Wham! performing during the pop duo's 1985 world tour, January 1985. In the background are backing singers Pepsi and Shirley -  Helen DeMacque (left) and Shirlie Holliman. 'The Big Tour' took in the UK, Japan, Australia, China and the US. (Photo by Michael Putland/Getty Images)