Julia Louis-Dreyfus
"Done," the Veep star wrote when she completed the cold challenge.
Nina Dobrev
"If you're gonna go in , you gotta go ALLLLLLL in. #ALS," the former Glee star wrote before taking her challenge deeper into the water.
Grey's Anatomy Cast
Dressed in scrubs, Jesse Williams, Ellen Pompeo, Jessica Capshaw and more cast members completed the challenge.
Tori Spelling
Hubby and kids got in on the ALS challenge fun by pouring ice cold water on the former Beverly Hills, 90120 star's head.
Shakira
"#ALSIceBucketchallenge CC: @3gerardpique @giseleofficial #PopeFrancis @coldplay #ChrisMartin," Shakira wrote when she shared her video on Instagram.
Jon Bon Jovi
The Bon Jovi frontman shared a YouTube video of himself getting drenched with ice water on Aug. 16 and nominated his band mates to go next.
Bret Michaels
The Poison rocker underwent the freezing task onstage during a solo show.
Chris Pratt
The Guardians of the Galaxy star pre-gamed before his challenge.
Carrie Underwood
The pop and country superstar and husband Mike Fisher took the Ice Bucket Challenge to the extreme!
Stephen Amell
The Arrow hunk stripped down for his challenge ...
Kerry Washington
The always stylist Scandal star went 2 for 2!
Taylor Swift and Jaime King
The pop and country superstar shared a video of herself and the model and actress taking on the challenge at a 2014 MTV Video Music Awards rehearsal and it was SO money!
Robert Downey Jr.
Iron Man himself appeared wet and shirtless when he took on the challenge, administered by his loving, pregnant wife, Susan Downey.
Bill Gates
The tech tycoon devised a creative way to complete the Ice Bucket Challenge after accepting Mark Zuckerberg's nomination to partake in the frigid fun.
Oprah Winfrey
The media mogul shared her video with BFF Gayle King taking part in the fun and challenged "#StevenSpielberg, #HelenMirren and @DayalManish. In the name of ALS..."
Demi Lovato
The "Really Don't Care" singer took to her Facebook page to participate in the challenge.
Justin Timberlake
The handsome crooner shared his video on both Instagram and Facebook, where he wrote: "#ALSIceBucketChallenge. Thanks #PatrickDownes & #JessicaKensky for nominating me and The Tennessee Kids. We now nominate The Tonight Show Starring Jimmy Fallon and The Roots..."
Jimmy Fallon
The Tonight Show host and his house band happily obliged, along with comedians Rob Riggle and Horatio Sanz.
Ansel Elgort
The Fault in Our Stars actor posted his video to Instagram and wrote, "This is for a good cause, #als aka #lougehrigsdisease research! I may scream like a girl at the end, but I donated like a man!!! (Lol) I gave 500$ today! What will you give??"
Elizabeth Banks
The Walk of Shame star took to her website to show off her video and challenge "Seth Rogen, Jesse Tyler Ferguson and Nathan Fillion to do it next."
Lil Wayne
The rapper joined in on the challenge in his latest YouTube installment of "Weezey Wednesdays."
Emmy Rossum
The brunette beauty wrote, "I nominate my costars from @yournotyoumovie: @joshduhamel & @HilarySwank," when she posted her video to Instagram.
Blake Shelton, Adam Levine & Carson Daly
The Voice crew accepted the challenge together.
Hilary Duff
The pop singer said "I accepted the #alsicebucketchallenge!," and nominated her sisters and friends to participate when she posted her video.