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21 August 2013, 14:26
The director of the film also says he thinks the movie is "five times better" than Justin Bieber's Never Say Never.
Morgan Spurlock gave Capital a short rendition of his favourite One Direction song on the red carpet of the band's This Is Us movie premiere last night (20th August).
The director was thrilled to see the turn-out for in London's Leicester Square and told Capital he'll always remember the premiere.
The Super Size Me star also talked about the differences between the group's flick and Justin Bieber's hugely popular Never Say Never film.
"We've got five singers in this band so I think it's already five times better," he said. "Now what I'm hoping is that it's five times as successful."
Watch Morgan Spurlock speaking to Capital FM on the red carpet of the One Direction This Is Us premiere below:
6,000 fans turned out to catch a glimpse of Harry, Niall, Zayn, Louis and Liam in London for the world premiere.
One Direction's This Is Us will hit UK cinema screens on 28th August.