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Eilish, 19, shot to fame in 2019 with her debut studio album, When We All Fall Asleep, Where Do We Go?, having worked on material with her brother from the age of 13.
This means that, while most of us were enjoying the various milestones of teenage life, she'd been thrown head-first into a world of sell-out arena tours - in turn missing out on some of the more 'normal' pastimes like grocery shopping.
Speaking to Vanity Fair, Eilish explained she'd discovered the joys of shopping online during the pandemic, which was when she realised she simply has no idea how much things are supposed to cost.
She said: "I don't know what things cost because I've never been an adult before.
"And, you know, I grew up with no money."
Eilish continued: "It's a really weird position I'm in. I feel kind of stupid because I'm like, I don't know how much Froot Loops are. I tried to order one box of Froot Loops and I was like, 'Oh yeah, sure. It's $35'.
"I didn't know that that's expensive.
"I ordered 70 boxes."
Vanity Fair explains she ordered the 'little ones', rather than the full-size packs, with Uproxx wondering if she'd gone for this pack of 70 single-serve, 0.95oz boxes from Amazon.
Eilish also touched upon her sobriety, having experienced grief at 15 when a friend took an overdose and ended up in rehab.
She said: "When I was growing up and I was around my group of friends back then, and they would all be drinking and smoking and doing drugs and whatever, I think because of the way that my personality is - I'm a very strong-willed person, and I think at the time I was very alpha - I'm coming to realise that I may have felt a feeling of superiority."
Eilish added that, as long as her friends are steering clear of hard drugs and being safe, she's not too worried - not that the issue comes up too much these days, anyway.
She said: "I'm not out here going to parties and also, I'm me, so I can't really go... anywhere."
Featured Image Credit: Instagram/Billie Eilish
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