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We all know celebritiess tend to have busy schedules ... but plenty of them find the time to give back, and we're shouting out a few of them for National Philanthropy Day!

Sure, stars like David Arquette and Gisele Bundchen might usually be spending time on sets or runways ... but they're not averse to supporting good causes and lending a hand when and where help's needed.

There's lots of others in our gallery -- maybe Chrissy Teigen , John Legend , or Alex Rodriguez might pique your interest -- check it out to see some of the biggest charity-minded celebs out there!

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