The ALS "Ice Bucket Challenge" is filling social media feeds and celebrities have joined in on the craze. The challenge has helped raise $15.6 million in donations, compared with only $1.8 million during the same time period last year, according to the ALS Association.

Here's a list of 20 famous people drenching themselves with ice water. The people they nominate are just as amusing as their videos.

20. Martha Stewart

19. Selena Gomez

Accepted!!!! @ryanseacrest @taylorswift my whole team is donating! 💜

A video posted by Selena Gomez (@selenagomez) on

18. LeBron James

17. Chris Christie

16. Taylor Swift

15. Chris Pratt

14. Justin Bieber

I accept, now I nominate @Theellenshow my main man President Barack Obama and @chrisdelia #alsicebucketchallenge

A video posted by Justin Bieber (@justinbieber) on

13. Jimmy Fallon

12. Justin Timberlake

11. Macklemore

10. Carrie Underwood

9. Kobe Bryant

8. Lady Gaga

7. The cast of Grey's Anatomy

It's on....@shondarhimes @scandalabc @kerrywashington @howtogetawayabc

A video posted by Ellen Pompeo (@ellenpompeo) on

6. Kerry Washington

5. Mark Zuckerberg

4. Sheryl Sandberg

3. Bill Gates

2. Ethel Kennedy

1. Oprah

I challenge #StevenSpielberg, #HelenMirren and @DayalManish. In the name of ALS...

A video posted by Oprah (@oprah) on

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