Aguilera wore a lot of great looks while she was preggers, but this wasn't one of them. Here again is an example of why you need to edit and tone down while pregnant. Where to look first? Her blouse that's ill-fitted across the bust with its baby-doll sleeves? Or her over-worked, Whatever-Happened-to-Baby-Jane hairstyle? One or the other needs to go.

It's clear that Richie knows a thing or two about styling the expectant mother. Aren't we lucky she's released her own line of maternity clothing? This is a great example of how to keep your personal style and still look chic when you're pregnant. Richie pairs a hippie-chic open tunic with a form-fitting, chic, black dress. Easy understated hair and flattering neutral makeup allow the extra long locket to put the focus right on that beautiful baby bump.

We're not big fans of matching your makeup colors to your clothing, and we're definitely not in favor of also matching your haircolor to your dress. Kelis' dress is actually quite flattering and chic (though it could fit a little better). But with blue hair, green hair, blue eye makeup and fire engine red lips, who's looking at the dress? This look wouldn't work whether she was pregnant or not. The rules of taste, proportion and editing still apply when you've got a bun in the oven.

The Kardashian's aren't always known for looking tasteful, but Kourtney scores big with this look. It's ok to show off your new ample bust, just don't make a display of it. This sexy gown in an understated color is cut just right to show off Kardashian's curves in a tasteful way. We love that she's kept her signature long hairstyle and flattering neutral makeup. A clean neckline is the right choice with this showpiece garment.

Here Watts has employed all the tricks to a gorgeous pregnant look. The rich color of this romantic gown makes the most of her pregnant glow. A dramatic but tasteful neckline shows off her mommy bust and the absence of a necklace ensures that she won't look overdone. Simple makeup in rosy neutrals allow her natural beauty to shine, and her low-maintenance medium-length hairstyle is the perfect frame for her face.