Producer Dev Hynes gave Mutya Keisha Siobhan a nice surprise this afternoon when he shared a track 

which they had recorded for fun at the end of their recent studio session.

Listen to the mash-up, which samples Kendrick Lamar's Swimming Pools, on the Soundcloud below:

Lay Down In Swimming Pools by Mutya, Keisha & Siobhan by Blood Orange

Dev Hynes wrote on Twitter: "Last week I finished recording with ‪@MKSOfficial & the girls felt like having fun at the end of the session -enjoy <3"

Mutya Keisha Siobhan added: "Haha cheeky ‪@devhynes!!! Glad everyone loves our mash-up!"

www.twitter.com/MKSOfficial

www.facebook.com/mutyakeishasiobhan