Demi Lovato's sister is "incredibly proud" of her.

Demi Lovato

Demi Lovato

The 'Sober' singer has been receiving treatment in rehab since she overdosed in July and Madison De La Garza is delighted her older sibling is "working really hard" on herself.

Speaking on 'Millennial Hollywood with Dakota T. Jones', she said: "Demi's doing...she's doing really well.

"She's working really hard on her sobriety and we're all so incredibly proud of her."

And the 16-year-old actress thinks Demi's problems will only make her family stronger.

She added: "It's been crazy for our family. It's been a lot. But we've been through a lot together and every single time... Every time we go through something, we always come out on the other side a hundred times stronger than before. And so we've just been so thankful for everything. For the little things."

When the 26-year-old star finally does leave rehab, Madison is looking forward to doing some "small" and ordinary things with the singer.

She said: "I guess I'm really excited to... I mean there's so many little things. It sounds so small, but go to [frozen yogurt outlet] Menchie's... Honestly, I'm more of a Pinkberry person, but she likes Menchie's and so we like we usually go there."

Demi's mother, Dianna de la Garza, recently admitted she was still "shaken" by the former 'X Factor' judge's overdose, but said her daughter is now "happy" and "healthy" as she works toward her sobriety.

She said: "It's still a really difficult thing to talk about. I literally start to shake a little bit when I start to remember what happened that day. [Demi's assistant called and] said, Demi overdosed. So, I was in shock. I didn't know what to say. It was just something that I never, ever expected to hear, as a parent, about any of my kids.

"I just feel like the reason she's alive today is because of the millions of prayers that went up that day when everybody found out what was happening. I don't think she would be here if it hadn't been for those prayers and the good doctors and Cedars-Sinai. They were the best. I couldn't have asked for a better team of people to save her life.

"She's happy. She's healthy. She's working on her sobriety, and she's getting the help she needs. That in itself encourages me about her future and about the future of our family."

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