Katy Perry and Calvin Harris have a new single togetherKevin Mazur/Wire]
The Scottish music producer's new single Feels features Pharrell Williams, Big Sean and, controversially, Katy Perry.
Calvin and Katy have issues with Taylor Swift in common so the collaboration seemed to some as a not-so-subtle dig at the 1989 star.
And given that Katy is currently in the news massively at the moment - what with her album release and constant Taylor comments - Calvin's released Feels at a pretty opportune moment.
It's unclear if Harris is back on good terms with his ex-girlfriend but Perry is certainly trying to make amends.
Having at first blamed Taylor for starting their famous feud, Katy now wants to let bygones be bygones and make up, even saying she loves the Shake it Off singer.
As a song, Feels has an upbeat summer feel, infusing reggae and funk with some creamy vocals from Katy and Pharrell.
It's all about being free to fall in love and not being scared to get serious with someone.
Verse 1: Pharrell Williams]
Now nothing ever lasts forever, no
One minute you're here and the next you're gone
So I respect you wanna take it slow
I need a mental receipt to know this moment at all