Selena Gomez and on-again, off-again boyfriend Justin Bieber are among the latest celebrities to take on the ALS Ice Bucket Challenge, which has surged in popularity over the past week as more stars continue to challenge others.
The campaign calls on people to share videos of themselves being drenched in ice water in a bid promote awareness for amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease. Participants then "nominate" others to follow suit.
Gomez was urged to do it by both Ryan Seacrest and by BFF and fellow pop singer Taylor Swift, who had taken on the challenge at her 2014 MTV Video Music Awards rehearsal with a group of some two dozen people, including model and actress Jaime King.
Bieber, who has dated Gomez on and off for more than three years and recently sparked reconciliation rumors with a cryptic photo of the two, shared his own Ice Bucket Challenge video on his Instagram page.
Using a saucepan instead of a bucket, Bieber challenged none other than President Barack Obama, as well as talk show host and comedienne Ellen DeGeneres and Undateable actor and Los Angeles comedian Chris D'Elia to follow suit.
Other celebrities who've also taken on the challenge recently include Guardians of the Galaxy actor Chris Pratt, who pre-gamed first, Food Network star Guy Fieri and rockers Jon Bon Jovi, who nominated band mates David Bryan, Richie Sambora and Tico Torres, and Bret Michaels, who completed it onstage at a solo concert. Check out their videos below.