The movie has made over £40 million, just three weeks after it was released.
And it looks like the 17-year-old's flick could overtake the second biggest grossing documentary March Of The Penguins.
Currently the top grossing documentary is Michael Moore's Fahrenheit 9/11 which earned £73 million, according to US box office statistics.
On Never Say Never's opening weekend it enjoyed the biggest opening weekend of any documentary in history, overtaking Fahrenheit 9/11 with takings of £18 million.