Sibling rivalry starts early in Rachel Zoe's family!

The expecting fashion designer told E! News' Alicia Quarles that her adorable son Skyler, 2, isn't exactly cool with the fact that he is going to be a big brother soon.

"He understands a little and I don't think he is that happy about it," she jokes. "He does not want to share his mommy. He doesn't even want to share his mommy with his daddy, you know? He's a little possessive."

Perhaps her little guy will be more comfortable sharing mommy once he starts school in a week.

For now Rachel and her adorable dude were spending quality time at New York Fashion Week, where the designer debuted her Spring 2014 collection. She even found time to have breakfast with him the morning of her show.

"It takes your mind into that and away from this," she says referring to the craziness of NYFW.

But despite being in the center of the whirlwind that is fashion week, the stylist was simply glowing. So what's her maternity style secret?

"Listen, nothing is more your friend, as a pregnant woman, than a caftan. Especially a light chiffon one," she shared.

Easy and breezy seems simple enough!

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