Billie Eilish can't stop hurting herself! The singer injured her ankle going down a set of stairs before a gig in July and again a week and a half ago, dancing!

We can't help but wonder if this isn't a style element for the emo-pop star, adopting the boot as part of her eclectic look. It's also a good excuse not to carry your own luggage!

Billie's style is a hit right now -- she's created an androgynous hypebeast feel that everyone's trying to copy ... including another famous singer we spotted at LAX the other day. Guess who!