Khloe Kardashian Says She 'Really Thrived' When Kim Kardashian Put on Pregnancy Weight -- Watch

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Ohh, Khloe Kardashian.

The 31-year-old reality star is always one to keep it real with exactly what she's thinking, and in a new preview for Keeping Up With the Kardashians, she is very honest with Kim about her experience during her sister's first pregnancy with North West.

"I really thrived when you were fat and pregnant and they compared you to a whale," she says to Kim. "That was the first time I was ever the thin one."

WATCH: Khloe Kardashian Looks Slimmer Than Ever on Date Night

"This is your moment to shine," Kim responds. "You've got to do every sexy photo shoot you can imagine."

"That's so sad that you guys have to be pregnant for me to be the thin one," concludes, referring to other sister Kourtney as well.

WATCH: Watch Khloe Kardashian and Kylie Jenner's Bootylicious Dance Party

Khloe has made health and fitness a priority in her life as of late, and in late August, she shared a super fit picture before her date with NBA player James Harden.

WATCH: Baeeeewatch! Khloe Kardashian and Kendall Jenner, in Matching Swimsuits, Show Off Their Bootys

And Khloe told ET that she counts her relationship with James as one of the factors in her healthy lifestyle.

"I think it's important to surround yourself with people who you share the same passions," she said. "And working out is one of my new healthy obsessions."

PHOTOS: Kim Kardashian's Baby No. 2 Pregnancy Style

As of late July, Khloe estimated that she has lost around 35 pounds.

Watch the video below.