Entertainment news website TMZ, quoting law enforcement sources, reported that Lovato was found unconscious at her home and was treated with Narcan, an emergency antidote for suspected opioid and drug overdoses.
Demi revealed in a documentary entitled Simply Complicated in October a year ago, that her substance abuse started at the age of 17 when she first took cocaine. Just last month, Lovato released a new song called "Sober", which includes lyrics indicating she was not sober anymore.
"We should all wrap our arms of love around Demi Lovato", tweeted Gaga.
In that documentary Lovato said that she tried cocaine at 17, right around the time she was shooting to fame on the Disney show Sonny With A Chance.
Lovato is one of the world's biggest selling artists and has had chart-topping hits such as Give Your Heart a Break, Cool for the Summer, Heart Attack, and Sorry Not Sorry.
A representative for Lovato did not immediately return a request for comment. "I'm touched", said Foxx, who also starred in her video for "Sorry Not Sorry". She has spoken out about her battles with drugs and alcohol over the years, and she's become a role model for young women and men who have faced their own issues.
Taking to their social media accounts, the Jonas siblings shared their love for star following her hospitalization on Tuesday.
Demi Lovato's Team Confirms She's 'Awake and With Family' After Apparent Overdose
Lovato, 25, a Grammy-nominated recording artist, was "okay and stable, reported People magazine, quoting an unidentified source". Demi Lovato is reportedly in a stable condition after being rushed to hospital following an apparent drug overdose.
"When I was in a relationship with Wilmer I went three years without purging, and when we broke up, that's one of the first things I did", said Lovato.
She last performed July 22 at the California Mid-State Fair in Paso Robles, California.
The pop singer has been open about her struggles with addiction, as well as her bipolar diagnosis, becoming a mental-health advocate.
"Tonight's previously scheduled episode of Beat Shazam featured a guest appearance by Demi Lovato", Fox said in a release.
Lovato often speaks about how important her fans are to her.
Lovato's show in Atlantic City, New Jersey was set to take place on Thursday but has been cancelled. "Love you. Not only for your incredible voice, for your incredible music, but for what you stand for and everything you do". "Our thoughts go out to Demi and her family", the statement read.
She was inked with the word "Free" and tagged her photo with the message: "Love is accepting someone for who they are".