A friend and colleague of singer Demi Lovato has called for an end to "negativity" as the star recovers from a suspected overdose.

The 25-year-old was rushed to hospital from her Hollywood Hills home last Tuesday after a suspected heroin overdose.

Dani Vitale, a back-up dancer on Lovato's shows, wrote on social media: "I care about Demi just like all of you do. I have not said anything about this situation until now because her recovery has been of the most importance.

"I was not with Demi when the incident happened, but I am with her now, and will continue to be because she means the world to me just like she does to all of you."

"Like all of you, I have nothing but love in my heart for her. There is no need for any negativity towards the ones who care about Demi at this time," Vitale continued. "There is too much of it in this world as it is."

"I know you're all feeling lost without her at this moment in time," Vitale concluded. "Remember that you have always been a community of Lovatics who LOVE. Please remember that when you take out your phones and start typing. Remember that we all love her more than we can ever put into words. Please continue to send her love during her recovery."