Lady Gaga has joined the celebrities taking the Ice Bucket Challenge for Lou Gehrig's Disease research in typical dramatic fashion. The bikini-clad pop star has uploaded a video of herself pouring a silver serving dish full of ice-cold water over her head while seated in a chair online. She says nothing in the footage, but posted the message: "#IceBucketChallenge #ALS #SharePainShowCompassion I nominate Adele, Michael Rapino, Vincent Herbert, and Arthur Fogel #RichPeople." Stars like Justin Bieber, Selena Gomez, Jon Bon Jovi, Carrie Underwood, Justin Timberlake, Eddie Vedder and Gwen Stefani also joined the challenge over the weekend (16-17Aug14), posting videos online of their chilly water moments. Vedder took the task on after Pearl Jam bandmate Mike McCready called on him and the rest of the group to join him in the ALS Ice Bucket Challenge. The Alive singer nominated pal Bruce Springsteen, One Direction star Niall Horan and actor Tim Robbins to follow his example. The celebrities are being nominated by famous friends to take on the icy bucket blast or donate to charity. Most stars are doing both. The campaign has been a big boost to charities connected to Lou Gehrig's Disease, aka ALS - more than $13 million (GBP7.6 million) has been raised since the end of May (14) and there have been over 1.2 million bucket challenge videos posted on Facebook.com.