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Kourtney Kardashian is one hot mama!

The pregnant Keeping Up With the Kardashians star and some gal pals had some fun in the sun Sunday afternoon, and Kourt could not have looked any cuter as she showed off her growing baby bump in a tiny bikini!

When things got too hot for Kourt and her posse, the ladies leaped into the pool. A stealth photographer was able to capture the swimsuit-wearing beauties mid-air—including Mason and Penelope's mama with her arms in the air and a huge smile on her face!

This probably isn't the last we'll be seeing of Kourtney in a two-piece, because the 35-year-old fashionista and Khloe Kardashian are spending this summer in Southampton overseeing their new Dash pop-up. Of course, other family members will be coming and going from the ladies' $13.9 million waterfront rental—and yes, the cameras will be rolling all summer long getting good stuff for Khloé & Kourtney Take the Hamptons!

But West coast dolls, don't be too disappointed—these bicoastal beauties will be making their way back home some, too. In fact, both were in L.A. for North West's first birthday party, otherwise known as #Kidchella.

Amaze!

Tune-in for a brand new episode of Keeping Up With The Kardashians next Sunday at 9/8c on E!