Secret Diana photo released 40 years later

A photo of Princess Diana and rock legend David Bowie smiling side by side at a concert in London seemed to have been hidden for decades.

But why did the royal family want to keep it a secret for all these years?

Keep reading to find out.

The year was 1987. Princess Diana was 25 years old and attending a charity concert at Wembley Stadium, where the legendary David Bowie would be performing that evening.