It's a celebrity baby boom these days, and having a bump presents beauty opportunities and challenges even for A-list celebrities. Check out the best and worst star baby bump looks.

On her fourth pregnancy, Klum has mastered the art of looking chic while carrying a bun in the oven. If you have a really special occasion while pregnant, consider having your gown custom fitted like Klum. It's so much more flattering and chic than the big flowing tent dress that will be your other option. A fuss-free updo hairstyle and neutral makeup keep the focus where it should be, on the gorgeous gown and beautiful bump.

Most of Berry's pregger looks were first-rate, but she missed the mark here. Too much information in the bust area and a hairstyle that looks more like an afterthought add up to an overall look that lacks taste. Remember, the same rules for coordinating a look still apply when you're expecting.

The reality is that when you're shaped like Humpty Dumpty, you have to take more care when dressing for situations where you need to be taken seriously. Black is the hands-down choice. You can't go wrong. Jolie could command any conference table in this look. Keep your hairstyle and makeup understated and flattering ... just like you do when you aren't pregnant.

It looks like Spelling may have forgotten that she was expecting a baby, not impersonating one. It's important to edit and tone down your choices a bit when you're pregnant. Outrageous looks that can (maybe) work when you're slim become comical when you've got a baby bump. This look has too much of everything: too much hairstyling, too many patterns, too many details in the blouse.