PHOTOS Mackenzie McKee displays killer swimsuit body three months after pregnancy

Daaaaang! Teen Mom 3‘s Mackenzie McKee welcomed baby Jaxie just three months ago, but girl is already fitter than before the pregnancy.

Mackenzie and her family enjoyed a weekend away at the lake for Memorial Day — and she broke out her bikinis to celebrate the unofficial start of summer.

For the sake of comparison, here’s what Mackenzie looked like just hours before delivering her 8 lbs., 9 oz. baby girl on Feb. 7. Also pictured is her post-baby shot from April 17.

Mackenzie’s body is undeniably impressive — although, to be fair, getting back in shape was one of her biggest goals ever since getting home from the hospital. Family members helped her mission by volunteering to watch the kids while Mackenzie and husband Josh McKee work out every night.

In fact, fitness is such a focus for Mackenzie that she plans to make a little business out of it.

“I will be starting a YouTube channel with my personal workout routines,” she recently told us. (More on that conversation in our upcoming “Catching Up With Mackenzie McKee” post!) “It’s very important for me to stay fit and live healthy.”

In addition to working out, Mackenzie continues to breastfeed Jaxie “every hour.” Studies show that helps moms lose pregnancy weight.