Chris Martin has jokingly claimed Angelina Jolie and Brad Pitt kidnapped him.

The Coldplay frontman also pretended bodyguards for the couple, who got married in August, threatened him with a knife in a bid to get him to write and record the track 'Miracles' for the soundtrack of the 39-year-old beauty's new movie, 'Unbroken'.

Asked how the song came about, the 37-year-old rocker said: ''I got a message that said, 'Meet in this undisclosed location. You'll be blindfolded and picked up by seven ex-Navy SEALS. So they kidnapped me, hit me over the head, and sprayed me with Mace. When I woke up, I was in an office, and Brad Pitt was doing push-ups as Angelina Jolie was just sitting there with her crown on.

''There was also a guy holding a knife to my throat, and she said, 'Write me a song or else.' And Brad Pitt said, 'Yeah. What she said.'

''We wrote a song and then she said, 'It's through to the final eight,' and then we had live eliminations at her house. We came in second, but the main guy chickened out.''

After sharing his hilarious version of events, the British singer eventually admitted he was honoured when he was asked to appear on the film's soundtrack.

He told Vulture: ''I find that a little bit of limitation is really helpful when you're trying to create... It's the same way when someone says to me, 'Here's the film and the book. Write something about that.' It's really nice to have those limitations because otherwise, where do you start?''