EXCLUSIVE: Demi Lovato Reveals Why 'Stone Cold' Was 'the Hardest Music Video I've Ever Shot'

Demi Lovato is channeling her pain into a beautiful new project.

Only ET was with the 23-year-old singer to discuss her brand new music video for "Stone Cold." She says the song was inspired by her own "pain and heartbreak."

"Every time I write a song, or every time I do a scene when I act, I always draw from personal experience," she tells ET's Samantha Harris. "I think this song, a lot of people can relate to. For me, it was therapy, but I also knew that a lot of people could relate to it -- so I wrote it."

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Even performing the tune has its challenges, as Lovato applies the lyrics to new situations.

"The last time I performed it, it was early in the morning and I had sang it but I was actually thinking about my grandmother who wasn't doing so well in the hospital," she recalls. "I kind of related it to that experience that I was going through. She's doing a lot better now, so I'm excited, but at that moment -- you know, 'If happy is her, I'm happy for you,' and it was just kind of like, 'OK, if this is your time, then I'm OK with that.' ... I put my heart and soul into every performance, whether it's in front of two people or it's in front of millions on a talk show or something. When you channel that energy and you go to that different place emotionally, it's not easy."

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In the video, Lovato goes there -- singing her heart out in the middle of a beautiful, snowy mountain scene. The video was filmed in Park City, Utah, which holds a special spot in the singer's heart.

"It's like my getaway, so being able to go shoot this video in a place where I'm already comfortable, where I love it there, it was awesome," she says. "And obviously it's beautiful there, so we thought it was a good setting."

But also, a cold one.

"I didn't have a coat on -- I just layered and layered and layered, so it was difficult," she confesses. "It was actually the hardest video I've ever shot. One, because emotionally it's difficult, but two, at one point, I'm in the snow and it's up to my waist -- that's literally how deep the snow was -- so when you have like three pairs of leggings and you're in the snow, and it's not snow pants, I wrung my pants afterwards. It was just soaking wet because I had been in the snow for so long."

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The video debut comes about a week after Lovato's show-stopping tribute to Lionel Richie at the GRAMMYs.

"It's such an honor to be able to perform that in front of him anyways, let alone at the GRAMMYs," Lovato gushed, "but then when he had a positive reaction to it, I felt really good about it. I could also see him in the audience, so I knew that he was enjoying it."

Up next for Lovato is the Future Now tour with her longtime pal, Nick Jonas, kicking off this summer.

"We've toured together before, so we obviously have had a lot of fun and we know that it's going to be a fun experience again, but we just opened up our own record label called Safe House Records," Lovato says. "Not only are we really good friends, but we're also business partners now. It makes a lot of sense that this point in our career to go on tour together. It's exciting for us. We've never toured just me and him, so it'll be fun."