Demi Lovato has given the Kardashian sisters a huge shout out for making curvy sexy.

The Cool For the Summer singer has been open about her own battles with body image, and now she admits Kim, Khloe and Kourtney Kardashian signalled the charge for her to get healthy.

In an appearance on the Ellen DeGeneres Show, which aired on Wednesday (10Feb16), Demi reveals Kim, in particular, should take credit for revamping what is considered hot.

"When I was growing up at the kind of age where your body starts changing... it was in that era when very, very, very thin people were popular in Hollywood, so that's what I had to look up to.

"When the Kardashians came on the scene, that was the first time that I really associated curves with beauty, and it was just so new to me. I remember thinking, 'Wow, that's so cool!' And even in a time when I was still struggling with food, I was able to look at Kim's curves and be like, 'I should really be proud of my curves'."

Demi battled an eating disorder and checked into rehab in 2011 to tackle her body image issues.

"Now there's tons of beautiful, curvy women out there," she adds.

During the TV chat, the Latina also opened up about her romance with "handsome" boyfriend Wilmer Valderrama, confirming the couple is not engaged, adding, "I don't see a ring (but) I wouldn't mind if I saw one."

Demi and Wilmer have been dating "on and off" for five years, and the singer says, "There's time for everything."