Lucy Guo, who recently dethroned singer Taylor Swift as world's youngest billionaire, told Forbes that she still uses a "pretty old Honda Civic". "I don't like wasting money...Everything I wear is free or from Shein...Some of them aren't going to be that great quality...I still literally buy buy-one-get-one-free on Uber Eats," she said. "I'm not showing-off to anyone," she added.