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It’s baby-birthing mania over at the National Zoo. The zoo’s 5-year-old lion Shera gave birth to a litter of four cubs overnight. The first-time mom is resting comfortably with her new pests.

And that’s not all, folks! Baby daddy Luke also likely knocked up Shera’s sister, Nababiep, in June. She’s expected to give birth sometime in September. Luke apparently gets around these parts.

Don’t get your panties in a bunch just yet. The cubs won’t make their public debut until later this fall. Prepare for collective sighs, squeals, and bursting ovaries at the sight of the cub cuteness. If you need constant cub updates, check out the Zoo’s Twitter feed and Facebook page.

Until then, enjoy this short video recorded last night while Shera was in labor. Prepare for cub screeching and then the most adorable and uncontrollable rolling and falling. Mom is too tired to care, but we’re in love.

Photo courtesy of the National Zoo.