Demi Lovato, Hilary Duff, & More Take On the Ice Bucket Challenge - Watch Here!

Check out Demi Lovato rocking a bikini while accepting the ALS Ice Bucket Challenge!

“CHALLENGE ACCEPTED Robert Griffin III!!! I nominate John Taylor, Christina Perri, Madison De La Garza, Wilmer Valderrama, and Phil McIntyre,” the 21-year-old entertainer captioned along with the Facebook video.

Demi isn’t the only one who is taking an ice bucket to the head to raise awareness for ALS, Hilary Duff, Conan O’Brien, and a shirtless Bryan Greenberg also have accepted the Ice Bucket Challenge.

“I accepted the #alsicebucketchallenge! I nominate @haylieduff @lowenban @lucytwobows,” Hilary, 26, captioned along with her Instagram video.

Click inside to watch Hilary, Bryan, and Conan‘s Ice Bucket video…