The 'Clown' singer-songwriter hailed the 'Roar' hit-maker as ''awesome'' after a recent trip to US where she hit the studio with the star to pen a track for her upcoming fourth studio album 'Prism'.
Emeli told The Sun newspaper: ''I've written a song for Katy Perry's album. We did a session together in New York. She was awesome, she knows what she's doing.''
The BRIT Award winner - whose writing credits include Alicia Keys 2012 hit 'Brand New Me' - may also feature on Britney Spears comeback album after contributing a song she wrote with UK hit-maker Naughty Boy.
Speaking of her work on the eagerly awaited follow up to Britney's 2011 album 'Femme Fatale', she said: ''Me and Naughty Boy did the Britney song and sent it off. It's fun writing for an icon and being Britney for the day.''
The popstar turned actress is back in the studio.
He is remembered by his ex-wife Kate Van Buren.
The ‘Hello’ singer had been due to play the Talking Stick Resort Arena in Phoenix on Wednesday night (August 17th).
Taylor Swift and boyfriend Tom Hiddleston reportedly spent the weekend together in Rhode Island after some time apart.