The Pretty Little Liars star challenged co-star Lucy Hale, plus Tommy Bertelsen and Zachary Quinto.
The One Tree Hill hottie looks good in a wet tank top!
The Fifty Shades of Grey star joined The Theory of Everything actor in the icy challenge.
"First of all Jason Kennedy, I hate you," Jenkins joked before he, Sadler, and more of the E! news team were doused with ice water.
The Guardians of the Galaxy star nominated Angelina Jolie, Putin and more bigwigs to participate in the challenge during his video.
"#ZacEfron takes on the #IceBucketChallenge with @ashleytisdale, donates to the ALSA.org and nominates #MatthewMcConaughey, #RobPattinson and #ErictheActor! #StrikeOutALS."
The pop princess captioned her video, "#SharePainShowCompassion," before nominating Adele among others.
The "I Luh Ya Papi" singer accepted and nominated collaborators Iggy Azalea and Pitbull, plus her BFF Leah Remini.
The Aussie rapper accepted J.Lo's challenge in a neon orange bikini.
After getting doused with ice water, the blonde cutie extended the challenge to her big sis'.
The supermodel's reason for doing the challenge goes deeper, with her caption reading, "My Uncle Milton and my dear friend Charlene's mom lost their fight to ALS..."
"I accept the #ALSIceBucketChallenge @JamieLynnSpears...," the "Circus" singer wrote when posting her video.
The Biebs used a kitchen item often used to make mac n' cheese during his challenge.
The pop star shared a video of herself undergoing the freezing task on Aug. 16.
The handsome hunk did the "#ICEBUCKETCHALLENGE!!!! semi-nude.
The soccer star wrote, "Thanks for the ALS Ice bucket challenge nomination Ryan Seacrest," when he shared his acceptance of the challenge on Facebook.
The funny woman took a different approach to the challenge.
The Girls star stepped up to her costar Lena Dunham's challenge and asked her fans to donate to ALS.
"I had to take it to the streets of NYC, said the British popstar when she shared her video.
The brunette beauty took to her Instagram page to share the three getting splashed with ice water.
The Big Bang Theory actress took to Instagram to post her video and nominated "@joshgad & @nicknamaste."
The One Direction singer inadvertently turned his challenge into a wet t-shirt contest.
Stripping down to his skivvies, the soccer stud was "happy" to participate in the challenge.
With guns (and a bucket) of steel, the blonde hunk poured ice water over his head for ALS.