It's fine to get wet at a pool party, but not before you go swimming. Just ask Kourtney Kardashian, who celebrated her 31st birthday at Wet Republic on Saturday.

Before the birthday girl could hit her bash, she had to take care of some boob business.

"Right before we walked down, Kourt was pumping her boobs to make sure the milk wouldn't start leaking at the party!" Kim dished to E! News about how things have changed for the famous sisters since the arrival of baby Mason.

(We're sure she appreciated the TMI scoop!)

Although Mason and baby daddy Scott Disick weren't at Kourt's Sin City pool party, Kourtney told E! that her boyfriend celebrated with her the weekend before...

"Scott surprised me and we went to Santa Barbara and had a little away time," Kourtney said.

But their relaxing getaway didn't last too long—the new mom says she was ready to leave at 7 a.m. the next morning to get back to her baby!


See more stars in Sin City in our Party Pics: Vegas gallery!

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