The 'Burn' hitmaker has teamed up with the superstar DJ once again, following the success of their song 'I Need Your Love', which reached number four in the UK Singles Chart in 2012.
Ellie posted a photograph of Calvin on her Instagram account today (18.06.14), along with the caption: ''Studio with this really tall person''.
The DJ looked busy on his laptop and appeared to be enjoying a drink or two, as a bottle of Smirnoff vodka can be seen in the photograph.
In other snaps the pair are seen together smiling and pulling faces while Calvin points towards Ellie and fans were quick to comment on the news they are making music together again.
One posted: ''Sweet!! love you guys together (sic)''
The Scottish producer, who has split from singer Rita Ora, and Ellie were also rumoured to be dating after they shot the romantic video for 'I Need Your Love', in which they kissed throughout the promo.
Ellie denied the rumours but said: ''We'd love to do another track together soon.
'''I Need Your Love' was so much fun to make, we have a special connection - but just a musical one.''