Pouring ice over your head for a good cause has gone Hollywood.

The popular ice bucket challenges for ALS have taken over our News Feeds, and thousands of people, even some famous names, have done their part to keep the hashtag going since late July. CEOs, actors, musicians and athletes have put together creative and entertaining videos to help raise millions of dollars for the ALS Foundation, calling out some of their famous friends as well.

To take part in the challenge, participants film themselves pouring a bucket of ice water on their head. Once they've taken the plunge, they call out three friends to take on the challenge, or donate $100 to the ALS Foundation, and upload the video to a social media platform.

From an elaborate stunt planned by Bill Gates to a quick and cold dip with Robert Downey Jr., this celebrity wet T-shirt contest for a good cause is everywhere.

Celebrity Ice Bucket Challenges

49. Taylor Swift

50. Kaley Cuoco

51. Shaquille O'Neal

52. Lebron James

53. Lena Dunham

54. Julia Louis-Dreyfus

55. Iggy Azalea

56. Drake

57. Katy Perry

58. Allison Williams

59. Jack Black

60. Alyssa Milano and son