The Tik Tok singer has been embroiled in a sexual assault legal battle with mentor and producer Dr. Luke for over a year, and in February (16), a judge denied her bid to walk away from her recording contract with his Kemosabe Records and parent company Sony Music, which she claimed restricts her from working with any other producer.

Shortly after her court loss, the Grammy Award-winning DJ volunteered to produce a song for Kesha via Twitter, and on Monday (25Apr16), Zedd returned to the microblogging site to prove he had followed through with his offer.

The 26-year-old, real name Anton Zaslavski, posted a photo of himself sitting at the soundboard in a recording studio alongside a mystery woman, whose back is towards the camera.

Eagle-eyed fans noted Kesha's rainbow-coloured tresses peaking out from under a wide-brimmed hat - a look she sported when she joined Zedd onstage at the Coachella festival in California on 16 April (16), when she made her first performance since her court case with Dr. Luke began.

Kesha sang an emotionally charged version of Zedd's track True Colours, and many fans believe their studio session was arranged so they could record an official version of the duet.