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Being pregnant isn't slowing down Kourtney Kardashian!

The star of Kourtney & Khloé Take Miami had a busy weekend of hosting events with her sister.

Saturday, they partied at Enclave in Chicago. On Sunday, the Kardashian sisters hosted a poolside soiree at Wet Republic in Sin City.

Kourtney, who's five months along, told E! News she doesn't know if she's having a boy or girl yet.

"I don't know if I'm going to find out," she revealed.

The mom-to-be also told us how being pregnant has changed her Vegas party style...

"I have to keep hydrated and keep my baby healthy," she said of staying cool in the sweltering desert temps.

Aunt-to-be Khloé said she's going to spoil the baby rotten. "I'm gonna buy it everything!" she told E! News. "I'm like that with my little sisters, so I'll be like that with any kid."

Kourt also confirmed that she and baby daddy Scott Disick are back on. "Scott and I are back together and very happy," she said. "We're both very excited for this new chapter in our lives."

Scott was a no-show for the girls' poolside party, but he was spotted partying solo at Wet Republic the day before.

Get more of Kourtney and Khloé in our special gallery!