Demi Lovato is taking fans to Timberline Knolls, the Illinois treatment facility she entered in late 2010 to deal with her personal issues. During her documentary, "Demi Lovato: Stay Strong," airing Tuesday on MTV, the singer/actress visits the rehab center to reflect on her experience.

"The first time that I walked into Timberline Knolls, I sat there to eat my first meal, and it was chicken, rice, vegetables and milk, and I took like two or three bites of the chicken and was like 'OK, I'm done,' " she said, recalling how stubborn she was to eat it. "That's when I realized maybe I do belong here because I can't finish a meal."

Lovato entered the facility in late October 2010 and was eventually released in mid-January. But, she had to ring in the New Year at the facility, something she said she couldn't believe at the time. "We got to watch the countdown on New Year's Eve in here, and by the time it hit 1, I just started sobbing like, 'I can't believe I'm bringing in the New Year in rehab,' " she recalled.

In another clip, one of the more lighthearted parts of the doc is teased. In it, Lovato and her crew let loose on her tour bus, dancing around and having fun. During the scene, she opens up about how difficult it can be for her to have fun. "One of the hardest things was learning I was worth recovery," she shared. "And I'm allowed to celebrate it, which is a great feeling."

Lovato is set to welcome fans into her life when "Stay Strong" debuts at 10 p.m. ET/PT Tuesday on MTV, followed by a live Q&A with the star during "The After Show" at 11 p.m. ET/PT.

"I've just been working at it a day at a time and have been trying to continue to fight my hardest," she told MTV News about still dealing with her problems in the public eye. "And I've had my ups and downs, and I'm still trying, but overall, it's been a really great journey, and I'm thankful for everything that I've been through."

Don't miss "Demi Lovato: Stay Strong," debuting Tuesday, March 6, at 10 p.m. ET/PT on MTV.