The 25-year-old singer understands some people need to have cosmetic surgery for medical reasons, but thinks most who have it should think more about their personalities.
She said: "I agree with cosmetic surgery for medical reasons – my mother had breast cancer and I think it's very sad when somebody has no choice in what happens to their body.
"But seeing what she went through made me think that, if you're a healthy human being, why would you even go there? It's very superficial to change what you have. I think everybody should focus on inner beauty."
However the London-born star reveals she is lucky because she has a mother who gave her self confidence.
She told Britain's Hello! magazine: "I think it's important to feel good inside and feel that you're worthy. I'm really lucky because I was brought up by my mother, who filled me with possibilities – she made me feel like every dream was possible.
"There's nothing better than achieving your goals, whatever they might be."
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