We know expectant mothers are proud of their little packages, but is donning a sheer top just TMI?

First Charlotte Gainsbourg wore a black see-through blouse over her baby bump in Cannes, and now January Jones has been spotted rocking the same look while walking her dog with a friend in L.A. Are sheer tops a new trend for mothers-to-be?

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A pregnant January Jones in a sheer top. Photo via GONZALO/bauergriffinonline.com

We think the "Mad Men" star looks kinda cool in hers. It's an improvement over Charlotte's attempt, so we're excited to see how far this motherhood fad can go. And while we've never been pregnant ourselves, we can only imagine that it gets pretty hot carrying around the extra poundage. Sheer fabric probably gives mom a cool breeze, no?

Looking good! Photo via GONZALO/bauergriffinonline.com

Maybe seven-months-pregnant Victoria Beckham will be next to jump on the sheer-top train. She could probably afford some more stylish yet functional maternity wear. Remember those sky-high heels she wore to the royal wedding? Ouch.

What do you think of the sheer top look for mothers-to-be?

Need expert tips on how to wear sheer clothing? Watch this: