Click here to visit Demi Lovato's profile page

The 18-year-old singer-and-actress left an unnamed clinic in Illinois in January after being treated for "emotional and physical issues", and she has now released a video expressing her gratitude to everyone who supported her during the “darkest time of her life”.

In the video, posted on website, she said: “I wanted to let you know that I am back and home. And I wouldn't be here today if it wasn't for the support you guys have given me along the way.

"I read all of the tweets and the fan mail and your support is what got me through this. So I couldn't be more thankful for everything that you guys sent me.

"The journey that I’ve been on has been very, very difficult over the past few months. I was dealing with issues that I know not just girls my age, but of all ages are dealing with. I hope one day to raise awareness of everything so that I can help people in the same way you guys helped me through this rough time.

“I can't tell you how much light you guys brought into my life at probably the darkest time of my life. Without you guys I wouldn't be here today.”

Demi – who stars in the TV series 'Sonny with a Chance' - also revealed she is returning to work following her treatment and is looking forward about getting the chance to thank her fans in person.

She added: "I wanted to let you guys know that I'm excited to get back to work and I can't wait to tell you what the future holds. I can't wait to see you guys in person and thank you all individually. I love you all and I couldn't have done this without you.”

Demi entered rehab voluntarily at the beginning of November 2010 after an incident in which she allegedly punched backing dancer Alex Welch.

In December, the Disney star settled her dispute with the dancer by giving her a sum of money in compensation.

Click here to visit Demi Lovato's profile page