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Nicole Richie and Joel Madden are so inspired by watching their little Harlow grow, that they've decided to grow their commitment to the Richie-Madden foundation...and maybe even their family!

"I think being parents -- it opens yours eyes," Joel tells Extra. "Every child I look at, it reminds me of my child -- it makes me want to take care of every kid." And the Richie-Madden foundation has found a new way of doing that -- if you text the word "child" to 90999, $5 will be added to your phone bill and sent to the foundation! Sounds easy enough!

And what about another "child" of their own? "If it happens, it happens," says Nicole.