*Chris Martin’s duet with Rihanna for the new Coldplay album took months to come to fruition, because the singer had to drum up the courage to ask her.

RiRi sings on the band’s new album “Mylo Xyloto” on a duet with Martin, entitled “Princess of China.”

Martin said he had Rihanna in mind as the ideal guest vocalist, but was too nervous to ask her when they first met.

He tells Britain’s The Sun, “The album is designed as a whole piece. It has boy and girl lead characters and top of our list for the girl part was Rihanna… but it took a while to pluck up the courage to ask her. We did a show in Las Vegas and I met her and said, ‘Do you think there’s any chance?’ I was very Hugh Grant-like and spluttering about it.

“She has such an amazing voice and it’s so different to mine. When the vocal happened I thought ‘Wow, you sound different’ but I think that’s also because she was singing a different song to what we are used to hearing from her and it is written by a bloke from Devon (England).”