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Kendall Jenner in a bikini

Swimwear or underwear? Kendall Jenner had us asking that very question on the Fourth of July. The answer? Some things just aren’t black and white — though this is and we still have no clue. (Photo: Kendall Jenner via Instagram)

Celebrities Wearing Bikinis: Summer 2017

Suzy Byrne
Editor, Yahoo Entertainment

In honor of #NationalBikiniDay or #InternationalBikiniDay (depending on which list of fake holidays you’re looking at), here are stars looking sizzling in two pieces so far this summer.