Talkshow host Ellen DeGeneres wrote that it broke her heart that Lovato was going through this. Azalea revealed to ET that she knew about Lovato's relapse and was anxious someone would use the news against her, but said ultimately, she was proud of Lovato for sharing her struggle in "Sober".
The rep noted that Lovato and her family "want to express thanks to everyone for the love, prayers and support".
Representatives for Lovato did not respond to a request for comment.
Our sources say Demi was transported from a home in the Hollywood Hills just before noon Tuesday, and is now being treated.
Weather: Likely some showers and storms overnight
Partly cloudy and cooler Thursday with highs in the upper 70s to lower 80s. Rain totals for many could range from 5 to 10 inches since last weekend.
"Sober" does not reveal the nature of Lovato's relapse, but she sings, "I'm sorry for the fans I lost who watched me fall again".
"Momma, I'm so sorry I'm not sober anymore/And daddy please forgive me for the drinks spilled on the floor", her lyrics read.
"The eyewitness tells ET that at one point during the concert, and just before singing the last verse of the her hit song "Sober", Lovato said, "'F**k, I forgot the words' and walked off stage.
Lovato's tour was scheduled to continue on Thursday, with a performance in Atlantic City, New Jersey, before heading to Mexico in September for a string of worldwide dates that would continue through the end of November.
"We have chose to replace the episode of Beat Shazam with another all-new episode".
Gunman dead after shooting 14, killing one, in Toronto: Canadian police
At this time, the conditions of the victims are unknown and a young girl is among those who were shot, police said on Twitter. A mass-shooter is dead after opening fire on a group of people outside a restaurant near downtown Toronto .
She's now on tour and was scheduled to perform in New Jersey this week. Their occupants did not stop to speak to reporters. "I'm touched", said Foxx, who also starred in her video for "Sorry Not Sorry".
She entered rehab at the age of 18, where she was diagnosed with bipolar disorder.
The two rose to fame alongside one another on Disney's Camp Rock, and patched up a short blip in their friendship to become extremely close over the years. Her 2015 album, "Confident", earned her a Grammy nomination for best pop vocal album.
On Sunday, Lovato performed at the California Mid-State Fair with Iggy Azalea.
Toronto shooting: Faisal Hussain identified as suspect in Toronto mass shooting
Jessica Harrison said she went to school with Fallon and that she attended the prayer service and vigil to remember her. The incident comes with Canada's largest metropolis concerned over a spate of shootings, more than 200, this year.