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Pump it up!

In this bonus Keeping Up With the Kardashians clip, Khloe Kardashian grills Kourtney Kardashian and Kim Kardashian about pumping after she sees Kourt drinking a special tea to boost her breast milk.

"Oh my god! Thank god I didn't have a sip," Khloe says. "What would happen?!" She continues, "If I pumped now and it makes those noises, what would come out?"

"Eww, nothing!" Kim responds. "Like pus. It would be so gross."

"Does it turn you on when that happens?" Khloe asks laughing. Watch the clip to hear Kourtney's response!

Don't miss an all-new episode of Keeping Up With the Kardashians Sunday at 9 p.m., only on E!