Eric Lively, Blake Lively, Justin Theroux, Sebastian Theroux

Jen Lowery / Splash News;

All good things come in pairs! And for these Hollywood celebs it's a great set of genes.

Justin Theroux and Blake Lively are only a couple of celebs that have beyond sexy siblings. Little did we know a handful of stars are related to some seriously super-attractive brothers and sisters (lucky us!).

We guess the saying is true: Good looks do run in the family—especially in the A-listers' bunch.

So, in honor of National Siblings Day let's take a moment to look at these smokin' hot brothers and sisters.

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