19 Kids and Counting: The Duggar family go street preaching

The stars of the hit reality TV show 19 Kids and Counting are taken out of their comfort zones in a new film where they learn to do open air evangelism.

Author and evangelist Ray Comfort shows the Duggar family what to do, and then they put it to the test. Eldest son Joshua Duggar is seen preaching outside the White House and parents Michelle and Jim Bob preach at a local university.

Comfort, who produced the film, said: "If you follow the famous family, you've no doubt enjoyed watching them throughout their many adventures. From shopping and preparing meals, to traveling and skydiving, with a family of 19 kids it's always life at the extremes. But you've never seen them do anything as exciting or controversial as open-air preaching."

The film reveals much more about the family's faith that has been such a major influence on the way in which they have raised their children.

19 Kids and Preaching is available for download from the Living Waters website. The DVD will be released on October 10.