June 15, 2016 12:00 PM

Her curves have been known to break the Internet (and remember that white swimsuit post on Insta?), but Kim Kardashian West still struggled with her famous figure after giving birth to son Saint last December.

“I love curves, but I don’t love my butt and my hips being so big,” Kardashian West tells PEOPLE exclusively. “I totally have insecurities.”

Kim Kardashian West
Courtesy Kesler Tran

Post baby, the reality star (who is also mom to 3-year-old North) even shied away from stripping down in front of her husband Kanye West.

“My butt was huge,” says Kardashian West. “I would walk backwards so he couldn’t see. And I would be so insecure about changing in a fitting like, ‘Babe, you can’t look at me!’ ”

For exclusive photos and much more from Kim Kardashian West, pick up the new issue of PEOPLE, on newsstands Friday

The entrepreneur admits that her husband “is such a good motivator.” Says Kardashian West: “I’d know when I was starting to look better because my husband would be like, ‘Babe, you look so good!’ he would never make me feel insecure. But I would always know when he was seeing a difference.”

To check out more behind the scenes from Kim, visit: kimkardashianwest.com/behind-the-scenes

Kim Kardashian and Kanye West
Ernesto Ruscio/Getty

Plus, “He loves that my ass is bigger,” says Kardashian West with a laugh. “And he loves when my boobs get bigger. When I was breast feeding, they were bigger than my babies’ heads!”

Keeping Up with the Kardashians airs Sundays (9 p.m. ET) on E!

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