The 22-year-old singer praised the 'Keeping Up With The Kardashians' star for her ''amazing'' full pout but says she feels as though she looks ''ridiculous'' with bigger lips.
When asked if she took part in the #KylieJennerChallenge, which sees Twitter users try to get fuller lips like the 17-year-old star, she told Shazam: ''Oh my God, I totally have. I look stupid.
''She [Kylie] looks great. I don't know how she can do it, but I draw lips on and I look ridiculous.''
Meanwhile, Demi previously admitted she uses social media to inspire her make up choices and enjoys copying the ''random beauty looks'' she finds online.
She said: ''I look for inspiration on Instagram and Pinterest. I love finding random beauty looks on there and showing them to my make-up artist.
''My signature beauty looks are pretty simple. I love a smoky eye or a red lip, but it's funny because I don't like to wear make-up unless I go all the way in - it's all or nothing!''
Demi is also a huge advocate for positive body image, after previously suffering from an eating disorder.
She said: ''Learning to love yourself isn't just one thing. It's a matter of taking care of yourself. One thing that helped me to gain body confidence is realising that I only get one body, so every time I go to eat something I think, 'Is this benefitting my body?' Sometimes it's not, but that's OK.
''Taking care of myself makes me feel better on days when I feel gross or when my clothes aren't fitting like I want them to, I know I'm doing what I can.''
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