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Few filmmakers would be ballsy enough to swipe one of cinema’s most famous — and parodied — pieces of music, Strauss’ “Blue Danube” waltz, forever synonymous with “2001: A Space Odyssey,” and find a fresh, poetic use for it.

When the deal was revealed late last year, Star called the novel a “ballsy and bawdy love child of ‘Mad Men’ and ‘Sex and the City.’

"I think he had his dad to help him with the letter but it was quite ballsy, you know: 'Brian Epstein’s got The Beatles; you need us', or something like that," says Underwood.

“One of the reasons I wanted to help was I thought what he was doing was so ballsy,” Cooper said.

“He has conviction and it’s so ballsy. Why is it that he’s doing that at this point in his career and other people aren’t following that example?”