Q: What miraculous invention can save you from poopy diapers and cranky tots in a pinch? A: The diaper bag! This is not simply a cute new accessory: It's the single most important must-have for moms on the go. So: What diaper bags do the stars rely on? Check it out! 

The award for the most expensive diaper bag ever goes to ... Halle Berry. She proudly carries daughter Nahla's nappies in a $980 Gucci diaper bag. (They make couture diaper bags, you ask? You bet your sweet bippy they do!)

But Halle definitely has some diaper-bag competition. Two words: Jessica Alba. The star mom of daughter Honor apparently has a diaper-bag obsession. She's been seen with a cavalcade of different bags, ranging from a relatively reasonable $164 bag by Serena & Lily to a $1,176 (!!!) Fendi bag -- which wasn't really intended to be diaper bag, but she made it into one, anyway. (Maybe she was just feeling frazzled that day and couldn't locate her actual diaper bag. We'd like to think so.)

Thankfully for us broke-ass plebe-moms, not all celebs go for the flashiest, most expensive ... er ... d-bags. Jennifer Garner, who is known for her understated-yet-chic style, opted for the low-key GO tote bag by Loom, which you can get for under $100.

Go to Celebrity Baby Scoop to catch up on all the celeb moms and see what they use to carry their baby essentials.