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Making a video for a global pop hit is an expensive business. There are stylists and hairdressers to pay for a start - and, um, flashing ice cubes don't come cheap.

Thanks to a court case which found that Katy Perry's 2013 US chart-topper Dark Horse copied a Christian rap song, details are now emerging of exactly how much it cost to promote and market the hit.

Nine jurors now have to decide how much the rap song's creators, Marcus Gray and two co-authors, are owed for copyright infringement.

Detailing some of the song's expenses, music executive Steve Drellishak, testifying on behalf of Capitol Records, told the court they included $13,000 (£10,729) for a wardrobe stylist, $3,000 (£2,476) for hair and almost $2,000 (£1,650) for flashing cocktail ice cubes.

Mr Drellishak said the expenses were essential to Perry's brand, and the singer's lawyers have said that tens of millions of dollars in total were spent on the hit to publicise it.

However, Gray's lawyers have emphasised the tens of millions brought in by the multi-platinum-selling song and Prism, the album it features on.

Dark Horse, the third single from Prism, spent four weeks at the top of the Billboard Hot 100 and earned her a Grammy nomination in 2015.

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Perry also performed the song during her half-time show at the Super Bowl in 2015.

Jurors are set to hear the closing arguments for damages on Thursday.