Selena Gomez vocal coach's Stevie Mackey says the singer's new material is inspired by Justin Bieber.

The two stars dated for a number of years before entering into an on-off relationship, which ultimately finished in 2014.

Speaking to Hollywood Life, Mackey said that Gomez has been channelling her thoughts on the matter into song.

He said: "She doesn't mention him directly.

"But one could deduce that she is [singing about him]. Most artists sing about their present or past relationships in their music. Selena's no different."

Gomez meanwhile recently promised fans on Instagram that she will tell the "truth" in the near future.

She posted: "Sometimes I get frustrated when I hear lies about who I am. The Internet is meant to keep you "updated" but it just takes old news and freezes it like it's now. You have watched me in pain and I've owned up to it through my music and actions."

"I grew up with you. I am beyond excited to show you the next chapter, the TRUTH. "I've been keeping so many secrets...I'm reborn in every moment so who knows what I'll become.. As long as I'm happy with me."

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Watch Selena Gomez's last video below: