Selena Gomez will make her comeback on the Julia Michaels song 'Anxiety'.

Selena Gomez

Selena Gomez

The 26-year-old pop star's first new music since she checked into rehab in October, after suffering an "emotional breakdown" following multiple hospitalisations due to issues related to Lupus and her kidney transplant, will be a feature on the track from the 25-year-old star's upcoming EP 'Inner Monologue Part I', which is released on Friday (25.01.19).

The EP also features One Direction's Niall Horan on closing track 'What A Time'.

Julia has helped compose hits for the likes of Ed Sheeran, Rita Ora and Janelle Monae in the past, but admitted she was feeling "more nervous" than ever about the release of her impending mini album.

Alongside the artwork posted on her Instagram account, she wrote: "INNER MONOLOGUE PART 1 OUT JANUARY 25TH. Couldn't be more nervous if I tried. But here's a piece of my mind and my heart. it's yours next week. (sic)"

Though 'Wolves' hitmaker Selena is yet to comment on the track, Niall, 25, took to Twitter to reveal his excitement at getting to work with the 'Issues' hitmaker, and teased their duet is "stunning".

He wrote: "So excited about this ! I'm singing on @juliamichaels album and I'm over the moon . Julia is one of my very very good friends and 'what a time' is absolutely stunning . I'm very proud to be part of this and can't wait for you guys to hear it . (sic)"

'Inner Monologue Part I' is Julia's fourth EP, her second on Republic Records, and follows 2017's 'Nervous System'.

Meanwhile, Selena's fans might not have much longer to wait for her much-anticipated follow-up to 2015 LP 'Revival'.

The former Disney star appeared on a live stream on Instagram Stories with her close model pal Connar Franklin in August, when she declared that she was "done" with the record.

In the video, she was heard saying: "My album's coming out later ... I'm done with it."

The track-listing for 'Inner Monologue Part I' is as follows:

1. 'Anxiety' (feat. Selena Gomez)

2. 'Into You'

3. 'Happy'

4. 'Deep'

5. 'Apple'

6. 'What A Time' (feat. Niall Horan)

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