With spring in full effect and summer just around the corner, knowing what shoes to wear on a daily basis is just as tricky as knowing whether or not to take a jacket. Too warm for boots, too cold for a barely-there sandal, a season of “will it, won’t it” weather is impossible to plan for, but after checking the forecasts (and remaining optimistic), we’ve finally taken our warm weather shoes out of retirement. And so, it would seem, have celebs, enter: Hailey Bieber and Kendall Jenner.

It’s not often we can rely on American celebs to dictate what to wear seasonally as they have the benefit of far better weather, but both Hailey and Kendall’s evening looks last night were all about the humble spring/summer sandal that we hadn’t considered partywear—the flip flop. Yes, heeled thong sandals are officially dressy enough (and cool enough) to be worn after dark, so even if you can’t quite imagine adding a sandal to your daytime looks quite yet, heeled flip flops are a chic option for after dark.