Jessica Alba and Gwyneth Paltrow aren't just rich, famous and beautiful celebrities. They're also moms, and as such, they're taking part in JOHNSON's Celebrity Hand-Me-Down Auction on eBay, which starts tonight, May 7, at 10 p.m. ET and runs through May 14.

You can bid on strollers, a diaper bag full of goodies and an adorable variety of kids' clothing donated by Alba. If that's not up your alley, spend your money on Gwyneth's "Get Fit With Tracy Anderson" package. That's Paltrow's trainer, as if you needed added incentive.

Either way, you're supporting a great cause, as all donations help raise funds for JOHNSON's Clean Water Initiative, an effort to make sure clean water is available to all babies. And if you end up with some fabulous star-worthy stuff, well, that's just killing two birds with one stone, right?

Below, Jessica Alba's donations for the Celebrity Hand-Me-Down Auction on eBay.