The celebrity backlash against the popular ALS Ice Bucket Challenge has begun with Pamela Anderson urging the stars tipping freezing water over their heads to research the charity they are helping. Some of the world's biggest names, including Justin Timberlake, Lady Gaga, Ben Affleck, Taylor Swift and Britney Spears have doused themselves with icy water and posted the footage on social media as part of the new charity phenomenon, aimed at raising money and awareness for the ALS Association, which is attempting to find a cure for Lou Gehrig's disease. But Anderson won't be joining them until the organisation stops funding animal testing. In a message on Facebook.com, she writes, "I can't bring myself to do your Ice bucket challenge. I enjoy a good dare - It's always good to bring awareness - in fun, creative ways. I don't want to take away from that... "I thought Instead I'd challenge ALS to stop Animal testing...Trying to cure human diseases by relying on outdated and ineffective animal experiments isn't only cruel - it's a grave disservice to people who desperately need cures." She continues, "Please, help scientists make real progress toward treating and curing human diseases by visiting HumaneSeal.org to find and support charities that never harm animals and which pour their time and resources into advanced, promising, human-relevant cures." Meanwhile, Pink's husband Carey Hart has also taken aim at the stars tipping water over themselves and then not donating to the cause. In a message on Instagram.com, he writes, "I went the contribution route. I figure ALS would rather have my money than see me wet..." On Twitter.com, he adds, "It's extremely creepy and annoying how obsessed people are w/ (with) this ice bucket challenge. The purpose is 2 raise money for an awful disease." Rapper Ice T has also taken to Twitter.com in recent days in an attempt to shame the stars who appear to be using the Ice Bucket Challenge to promote themselves and not the charity. And stars like actor Zachary Quinto are refusing to take the challenge because it sends the wrong message about the ongoing drought in California. He says, "In light of the staggering drought in California and the desperate need for clean drinking water in developing countries I opt for donating directly to project ALS in lieu of an ice bucket challenge."