“I wanted to help others. I wish that I had somebody when I was 13 years old and having an eating disorder and starving myself," Lovato reflected.
The JoBros have a personal connection to both former Disney darlings, as Nick Jonas famously dated Cyrus and Joe Jonas dated Demi.
"I don't know what I'm going to write about on my next album because I'm so happy," the star tells 'CBS Mornings.'
"I’ve waited my whole life to find you and I can’t wait to celebrate so many more birthdays together," Lovato captioned their adorable birthday post.
"Heart Attack" originally appeared on the singer's 2013 album, Demi.
The pair celebrated their first Valentine's Day together since announcing their relationship in August.
The tease comes just four months after Lovato dropped their latest album, 'Holy Fvck.'
Lovato wrote on their Instagram Story that the experience was a "dream come true."