Chris Martin has said that the band's collaboration with superstar Rihanna is his favourite part of Coldplay's forthcoming album, 'Mylo Xyloto'.

The lead singer, who recently said that each Coldplay album feels like their last, said that the song, 'Princess Of China' was written with the 'S&M' singer in mind:

"So, in like a dream scenario, we had a song that I'd secretly kind of written to see if Rihanna would want to sing it. And then the rest of the band wanted to keep it, so we came up with the idea of asking her to sing it with us, and, to our great surprise, she said okay."

He then goes on to say that they had nothing left to lose with the track which turned out to be his favourite one on the album:

"Well, her bit on our record is my favourite bit ... when the song came out, it sort of asked for her to be on it. And I think at this point, we have nothing to lose, and so we've been trying some new things and trying to break down the perceived boundaries between different types of music." 

'Mylo Xyloto' is Coldplay's fifth studio album and it is due to be released on October 24.

Check out the audio for 'Paradise', the second single single from 'Mylo Xyloto':