Kourtney Kardashian, Kim Kardashian

Alexander Tamargo/Getty Images

At first, we assumed this was an old Halloween photo of Kourtney and Kim Kardashian. Because, ya know, it's only been four months since Kourtney gave birth to Penelope Disick and, really, that's a skintight Batgirl suit.

Then we realized this is from last night's Halloween bash at LIV at Fountainebleau in Miami Beach, and our jaws haven't been able to come off the floor since.

The new momma-superhero makes the costume her own with platform heels and long straight locks next to her sister, Catwoman. (Who said bats and cats couldn't get along?!)

We know that every good superhero has a few tricks up their sleeves, and now we know what Batgirl's power is: being smoking hot arm candy.

To see what else these sisters get into, make sure to tune in to an all new season of Kourtney & Kim Take Miami this January only on E!

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