The film documenting the preparation for what would have been Michael Jackson's farewell concerts hits cinemas today.

It features never before seen footage of the star on stage and rehearsing for his 50 sold out shows in London.

The king of pop died just three weeks before the first show. This Is It is only being shown at cinemas around the world for two only weeks.

Cinemas say the demand for tickets has been unprecedented, with most of the shows already sold out.