Martin: I want to write Rihanna hit
The Coldplay frontman Chris is hoping to reunite and collaborate with the 26-year-old singer on her next album, and has already written some new material for her.
Chris told New York radio station Fresh 102.7: "I don't think she even asked, I just said, 'Please can I try something?'."
He admitted getting his song on Rihanna's record isn't easy.
"She has so many amazing people writing for her," he continued. "It's like trying to win American Idol, getting a song on Rihanna's album. It's hard. Everybody wants to write songs for her."
The pair worked together on Princess Of China, which featured on Coldplay's 2011 album Mylo Xyloto.
Chris also hinted that Coldplay are to start work on their seventh album, following Ghost Stories.
"We knew we wanted to make this thing called Ghost Stories, and then make something else," he said. "We have just an idea and then we're gonna go on tour after that."