Shades are an essential part of any hot weather wardrobe, and black sunnies are all the rage this year. Celebs are taking care to choose an array of statement shapes that flatter their faces, like Rihanna's retro cat-eyed sunglasses or Kourtney Kardashian's thick, rectangular pair.

Rihanna's extreme cat-eye shape meshed perfectly with her hot pink lips and shaggy bangs.

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Kourtney Kardashian's rectangular, extra thick, fashion-forward frames paired quite nicely with her bangs. (BTW, isn't daughter Penelope the spitting image of her dad Scott Disick? It's uncanny.)

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Jessica Alba is always on trend, and she donned round shades that were oh-so-different thanks to the red arms. Who doesn't love a pop of color? The rest of her accessories with this outfit -- multiple necklace strands, the studded headband -- were on point as well.

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Demi Lovato's oversized square shades flattered both her round face shape and her golden locks. The contrast works for the singer.

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