Demi Lovato has been hospitalised for allegedly suffering an overdose.

The 25-year-old singer is believed to have been rushed to a Los Angeles hospital on Tuesday (24.07.18) after she started suffering from what appears to have been a heroin overdose, law enforcement sources told TMZ.

Sources allege the 'Sorry Not Sorry' hitmaker was transported from a home in the Hollywood Hills just before midday, and is currently being treated, with her current condition unknown to the public.

The alleged health scare comes as Demi has battled with addiction for several years - which she had sought treatment for - and had recently revealed she had broken her six years of sobriety through her new song 'Sober', which was released last month.

In the track, Demi alludes to having relapsed as she sings: ''Mama, 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.

''And I'm sorry for the fans I lost who watched me fall again. I wanna be a role model but I'm only human.''

And after the release of the song, the star took to social media to thank the people who have never left her side in throughout her turbulent battle.

Posting a video from a recent concert which includes the packed crowd cheering for the singer, Demi wrote: ''To my fans, my family, and my supporters, the ones who never left me, you are my light. I am forever grateful (sic)''

Demi has been open publicly with her battles with addiction - and her stint in rehab in 2010 - and emotionally celebrated her six year milestone during a concert in March.

The following month, she was snapped drinking from a red cup at Hayley Kiyoko's album release party - but she was quick to shut down her critics who doubted her sobriety.

She replied on social media: ''I don't have to defend anything but it was red bull.''