They may have only released their sixth studio album in May, however Coldplay front-man Chris Martin has confirmed that album number seven is already in the works, with plans to collaborate with Rihanna.

¡°We knew we wanted to make this thing called Ghost Stories, and then make something else¡± Martin said in a recent interview with US radio station Fresh 102.7. ¡°Worst answer of all time¡± he added, ¡°but we have an idea, then we¡¯re gonna go on tour after that.¡±

The British rock outfit, who were recently in Australia to play a one-off show at Sydney¡¯s Enmore Theatre, have hinted a tour in the near future.

Coldplay previously worked with Rihanna, when she lent her vocals to the band¡¯s single ¡®Princess Of China¡¯ from 2011¡¯s Mylo Xyloto. Remarking on the collaboration, Martin said: ¡°I love being in the studio with Rihanna. It wasn¡¯t necessarily with¡­ I was working for her. I don¡¯t think she even asked, I just said, ¡®Please can I try something?¡¯¡±

When asked if the ¡®Diamonds¡¯ singer would guest on Coldplay¡¯s next musical venture, he said: ¡°I hope so, yeah. I have a really nice song which¡­ maybe, I hope so.¡±

During the band¡¯s brief return to Australia in June, they caused quite the stir, with hundreds of fans crowding the streets of Newtown to star as extras in the video for their single, ¡®A Sky Full Of Stars¡¯. With Martin leading the crowd like a pied piper, it was all confetti cannons, cheesy smiles and cameras. The band also collaborated with our very own pop princess, Kylie Minogue, sharing the stage to perform the singer¡¯s 1995 duet with Nick Cave, ¡®Where The Wild Roses Grow¡¯ and the aptly named hit ¡®Can¡¯t Get You Out Of My Head¡¯.