Gillan, 24, is among a host of leading ladies photographed at London landmarks for the Government’s GREAT Britain campaign to boost tourism.
Also taking part is Harry Potter star Bonnie Wright, Oona Chaplin, granddaughter of film legend Charlie, and Lily James from Downton Abbey.
The stars were given exclusive access to Westminster Abbey, the Foreign Office and Hyde Park Barracks for a photoshoot.
Sandie Dawe, of VisitBritain tourism agency, said: ‘This will remind people London is a great city for fashion and shopping’.
The photographs are in Marie Claire’s October edition, out tomorrow.