Country biggest stars continue to do good, taking a stand against ALS! Carrie Underwood, Jennifer Nettles and Zac Brown Band are the latest to contribute to the Ice Bucket Challenge, both donating money and dumping water on their heads for our enjoyment.

Underwood joined husband Mike Fisher to participate in a big way. They took the challenge to new heights by removing the bucket, instead replacing it with a backhoe. Judging by Underwood's scream, it was breathtakingly cold. The starlet plugged her nose as the backhoe full of water dumped all over them. Out of breath and freezing cold, she then challenged Jennifer Nettles to step up next.

Nettles isn't one to turn down a challenge, and alongside Brandy Clark, she's made good on the dare already. Nettles "pre-challenged" Clark, who went ahead and joined her. Before having coolers full of ice cold water dumped on them, Nettles passed the challenge on to Kenny Chesney and Sara Bareilles, while Clark challenged Reba McEntire.

Zac Brown Band are also helping strike out ALS. The band was challenged by Hunter Hayes and clothing store Vineyard Vines to do the challenge, so they did it together -- with the help of a firetruck! With the truck full of water, they were each sprayed before a big ice water dump. Several backhoes (Underwood style) filled with water doused the band members, who continued to smile despite being soaking wet.

Watch Jennifer Nettles and Brandy Clark Take the Challenge

Watch Zac Brown Band Take the Ice Bucket Challenge!

Watch the Best of Country Stars Taking the Challenge