They've been close for years and have collaborated on two top 10 hits.

And and seem to be back at it again as they pose for a sweet selfie on Instagram on Thursday while in the studio. 

Scottish DJ Calvin, 38, teased to his 10.6million fans that a 'third installment' is currently being created by the pair. 

'Back in studio!': Ellie Goulding and Calvin Harris seem to be back at it again as they pose for a selfie in the studio on Instagram on Thursday

Ellie, 36, seemed in high spirits as she beamed while holding a pair of headphones in front of the microphone. 

The Love Me Like You Do singer cut a casual figure in a black T-shirt and matching tracksuit bottoms which she teamed with lace up boots. 

She styled her long brunette tresses in loose waves pulled over her one shoulder and lkrporno.com applied a radiant palette of makeup to showcase her beauty.  

Dream team: Scottish DJ Calvin, 38, teased to his 10.6million fans that a 'third installment' is currently being created by the pair after they previously collabed in 2012 and 2014  (pictured in 2013)

Meanwhile producer Calvin rocked a green and yellow flannel shirt as he held the camera high capturing the selfie. 

He penned to the post: 'Back in studio!!

It's time for the third installment of our banging song trilogy'. 

Ellie and Calvin have previously teamed up for hit single ‘I Need Your Love' in 2012 and also came together again for track