By CHELSEA HUANG
Celebrities are going nuts for the newest social media craze ... literally.
Hugh Jackman, 45, posted a photo Wednesday morning of himself grabbing his crotch -- and he's not the only one.
UK organization Check One Two took a cue from the wildly successful ALS ice bucket challenge for their #feelingnuts challenge, which asks participants to, well, feel their nuts to raise awareness for testicular cancer.
"The Wolverine" star spread the message by nominating famous pals Neil Patrick Harris, Michael Strahan and Ricky Gervais ... we can't wait to see what they come up with!
Other stars, like the boys of 5 Seconds of Summer and Jamie Oliver, have also joined in on the movement.
See their 'nutty' photos below:
Approximately 8,820 new cases of testicular cancer will be diagnosed in 2014, according to the American Cancer Society, and an estimated 380 men will die from the disease.
While there's no icy element involved in this challenge, we're curious to see if crotch-grabbing will nab the same $100 million result in donations. Nonetheless, it sure is more fun to look at!
More on AOL.com
Liv Tyler pregnant with second child, rep confirms
Jeter launches site to connect athletes to fans
'Twilight' is returning with new short films
Ben Affleck goes full frontal in 'Gone Girl'