updated 08/21/2014 AT 11:00 AM ET
•originally published 08/21/2014 AT 11:30 AM ET
The Oscar winner, 41, wore a bikini for her dousing, which she posted to Instagram as part of the ongoing campaign benefitting the ALS Association.
And she challenged Martin, her husband of a decade – from whom she uncoupled in March – to do the ice bucket next.
Martin isn’t the only one in Paltrow’s sights. The actress also challenged Cameron Diaz and designer Stella McCartney.