Singer Demi Lovato is awake and surrounded by her family in a Los Angeles hospital after a suspected heroin overdose, according to her agent.

The celebrity news website TMZ said police told them the 25-year-old was taken to hospital from her Hollywood home.

The American singer was reportedly treated with Narcan - an emergency treatment for narcotic overdoses.

Paramedics found her unconscious when they arrived at her home.

Demi Lovato: 'I'm not sober anymore'

In a statement, the star's agent said: "Demi is awake and with her family who want to express thanks to everyone for the love, prayers and support.


"Some of the information being reported is incorrect and they respectfully ask for privacy and not speculation as her health and recovery is the most important thing right now."

Image: Lovato has reportedly been taken ill in Los Angeles

The singer, who has struggled with substance abuse for some years, released a song recently called Sober, in which she reveals she had relapsed after she celebrated six years of sobriety in March.

Lyrics in the song include: "Momma, I'm so sorry I'm not sober anymore / And daddy please forgive me for the drinks spilled on the floor."

I love @DDLovato so much. It breaks my heart that she is going through this. She is a light in this world, and I am sending my love to her and her family. — Ellen DeGeneres (@TheEllenShow) 24 July 2018

i love u @ddlovato — Ariana Grande (@ArianaGrande) 24 July 2018

US chatshow host Ellen DeGeneres tweeted: "I love @DDLovato so much. It breaks my heart that she is going through this. She is a light in this world, and I am sending my love to her and her family."

Ariana Grande posted: "I love u @ddlovato."

Rapper Cardi B wrote: "We love you Demi Lovato."

The hashtag #PrayForDemi also trended on Twitter.

We love you Demi Lovato ❤️❤️ — iamcardib (@iamcardib) July 24, 2018

The singer, who found fame acting in children's TV series Barney & Friends, has been open about her addictions and her struggle with bipolar disorder and an eating disorder.

She has spent time in rehab and has admitted self-harming.

The Let It Go singer has also worked with charities in the US to raise awareness of mental illness.

A spokesman for the Los Angeles fire department said they received a call at 11.22am for a "medical emergency" and took a 25-year-old woman from a property in Hollywood to hospital.