Everything is topsy turvy!

In a new clip from Keeping Up With The Kardashians Kim Kardashian talks about seeing Caitlyn Jenner's tatas for the first time ...and how it made her want to get her own breast implants!

The pregnant reality star said, "I went into the closet [when she was changing for a photo shoot] and she was like 'you can stay' and she took off her top and her boobs were like Kourtney's when she first had them done. Like, it made me want a boob job. She has a full boob job. Like a 'C'."

We gotta say ... we didn't see this coming a year ago!

Tune into to E!'s hit show on Sunday nights to keep up with Kim, Caitlyn and the rest of the Kardashians.