The singer, 32, is the latest celeb to take part in the Ice Bucket Challenge – the social-media-driven stunt aiming to raise awareness and money for ALS – and she reveals her new physique in the video posted on her Facebook page.
The American Idol winner, who on June 12 welcomed her first child, a daughter named River Rose, jokes that she was nominated by "a ton of mean people" to undertake the chilly challenge.
While at first struggling to lift the ice bucket, Clarkson eventually manages to pour the entire icy stream on her head.
Clarkson, who wed husband Brandon Blackstock in an intimate October ceremony in Tennessee, seems to be reveling in her new motherhood.
"I still can't believe I made a human," she Tweeted in July, adding the hashtags "topthat" and "firstglassofwineintenmonths".