Kanye West's baby mama and his ex-gf Amber Rose have something in common -- both pregnant women are into black ... dresses.
Kim Kardashian was decked out in a tight lacy black gown last night in Las Vegas -- and about 4 months ago Amber was wearing ... a tight lacy black gown.
It's an odd coincidence, especially because Kim and Kanye were making their first appearance since their baby announcement -- just like Amber and Whiz Khalifa were back in September.
At least the dudes weren't matching.
Still, we gotta ask ...
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