The singer confessed she sometimes cringes when she stumbles on a snap of herself wearing something "horrendous", but she knows that in the moment she felt cool.
She tells Into The Gloss, "Sometimes I google myself and look at what I wore last year - it kind of sucks to see when you got it wrong, but it’s nice to have that instant yearbook.
"Oh my God - there was this time when I went to the Teen Vogue Young Hollywood party and I wore a shirt that said ‘Hotter than’ something, and a belt with these weird net-y tights and boots, and like, a sock - it looked horrendous and then I put a blue streak in my hair.
"And I remember, I looked in the mirror and I was like - 'I feel so cool.’ And I mean, that’s awesome that I felt so good. But I cringe looking at it now."
The Lose You To Love Me hitmaker insists that as long as what she's wearing makes her feel happy, that's all that matters, whilst she explains that it's impossible to define her style because it changes all the time.
"But I never wear anything for any purpose other than making myself happy," she adds.
"So I love dressing up, I like trying new things. I’m inspired by music constantly, too - you can get away with more daring looks, like a ton of glitter that’ll look awesome in certain lighting.
"I don’t think you should ever have to ‘define your style’ because when you’re 22, you probably aren’t going to dress the same way you did when you were 16.
"You can define it for maybe a year at a time and that’s it."
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