Jason Isbell is one of a number of artists sending well wishes to pop singer Demi Lovato following her reported overdose on Tuesday (July 24). The Americana star has battled addiction himself and tweeted that he was "hoping for healing ... and understanding" for Lovato.

"Hoping for healing for @ddlovato and understanding from those who don't know firsthand what addiction can do," Isbell writes. "Believe it or not, it could happen to you."

Isbell, formerly a member of the Drive-By Truckers and now a solo singer-songwriter, struggled with alcohol and drug addiction in his 20s and early 30s. In 2012, Isbell's now-wife, Amanda Shires, and two friends performed an intervention and got Isbell into rehab at Cumberland Heights in Nashville. He is now sober.

In addition to Isbell, Dan + Shay, Chely Wright and Brad Paisley were among the celebrities offering their positive thoughts to Lovato. Paisley and Lovato worked together on "Without a Fight," a song off of Paisley's Love and War album.

According to the Hollywood Reporter, Los Angeles police responded on Tuesday to a call at 11:39AM local time from a home in the 8000 block of Laurel View Drive -- Lovato's block -- in the Hollywood Hills. Police spokesperson Raymond Brown would not name the person who was transported to the hospital from the home; however, TMZ reports that the individual was Lovato, who had suffered what appeared to be a heroin overdose.

A law enforcement source tells TMZ that Lovato was treated with Narcan at her home, and that paramedics found her unconscious when they arrived. However, People reports, via a source close to the singer, that the overdose was not heroin related.

"Demi is awake and with her family, who want to express thanks to everyone for the love, prayers and support," a representative for Lovato tells the Hollywood Reporter in a statement. "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 has struggled with substance abuse, as well as bipolar disorder and bulimia, in the past but entered a treatment facility in 2011 and had been sober for six years as of March. However, Entertainment Weekly reports, her new song "Sober" addresses the fact that she relapsed recently.

The Boot will update this story with more details as they become available.