Pop singer Demi Lovato is “awake” and talking in hospital after an apparent drug overdose, US media reports say.

The star, 25, was rushed from her Hollywood Hills home on Tuesday (US time) to a Los Angeles hospital, multiple sources said, with a Lovato insider saying her condition was “stable”.

Lovato’s publicist confirmed in a statement that the Sorry Not Sorry singer is recovering.

“Demi is awake and with her family who want to express thanks to everyone for the love, prayers and support,” the statement said, according to People.

“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.”

Lovato, who has battled addiction and mental illness for years, has spoken openly in the past about cocaine and alcohol abuse.

In March, Lovato said she had celebrated six years of sobriety, but in June released a song Sober, which appeared to suggest she had relapsed.

Its lyrics include, “Momma, I’m so sorry, I’m not sober anymore, And daddy, please forgive me for the drinks spilled on the floor. To the ones who never left me We’ve been down this road before, I’m so sorry, I’m not sober anymore.”

According to E! News, Lovato’s mother Dianna De La Garza and her 16-year-old sister Madison De La Garza were seen at the hospital in the afternoon.

TMZ reported Lovato was found unconscious in her Hollywood Hills home and quoted law enforcement sources as saying she was treated with Narcan, an emergency treatment for suspected opioid and drug overdoses.

Los Angeles police said they responded to a medical emergency on Tuesday involving a woman on the Hollywood Hills street where Lovato reportedly has a home, but declined to name the person.

Lovato rose to fame on Disney Channel 10 years ago with shows Camp Rock and Sonny with a Chance 10, and forged a pop career with hits like Skyscraper and Sorry Not Sorry.

Lovato began her career as a teen star on Disney shows. Photo: Disney

But while her star rose, her troubles grew.

In a 2017 YouTube documentary, Simply Complicated, Lovato spoke about years of substance abuse, eating disorders, and drinking, saying she first started using cocaine when she was 17.

She entered rehab at the age of 18, where she was diagnosed with bipolar disorder and reportedly treated for bulimia, self-harm and addiction.

According to People, she relapsed after leaving the treatment centre and checked in to a sober living facility for a year.

Lovato, who has some 69 million followers on Instagram, was in the middle of a US tour and due to perform in Atlantic City, New Jersey, on Thursday.

Ellen DeGeneres, Ariana Grande, Camila Cabello and country singer Brad Paisley are among those who have taken to social media to pen well wishes to Lovato.

“I love Demi Lovato so much,” DeGeneres wrote on Twitter.

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 (@EllenDeGeneres) July 24, 2018

“She is a light in this world, and I am sending my love to her and her family.”

you’re in my thoughts @ddlovato, sending you love ❤️

— camila (@Camila_Cabello) July 24, 2018

Paisley tweeted, “Addiction is a terrible disease. There is no one more honest or brave than this woman.”

Lovato talks about her struggle with addiction:

-AAP