Bryan Adams photographs Cher, Grimes and Iggy Pop for Pirelli calendar

Cher, 75, responds after Britney Spears, 39, says it is her 'dream' to travel with the icon

Britney Spears says she wants to go St. Tropez with Cher and have a 'six pack like J-Lo'

Cher stands out from the crowd in a luminous green hoodie and hot pink tracksuit bottoms