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.''
Over the past five years, Shia LaBeouf has gone from promising young actor to unemployable disaster and back again.
In Deepwater Horizon, Mark Wahlberg reteams with his Lone Survivor director Peter Berg.
The live album is set for released in November.
The movie begins filming in the UK.
The 'Sherlock' and 'Doctor Strange' star joined Gilmour onstage at the Royal Albert Hall for a rendition of the Pink Floyd classic.
Time to learn what Kathy Bates' character has to do with all of this.