'Grey's Anatomy' Cast, Nina Dobrev, Iggy Azalea & More Do ALS Ice Bucket Challenge [WATCH]

Over the last few days the ALS Ice Bucket Challenge has been heating up. While most of the participants are wishing the water in the buckets was what was heating up, the viral videos have been burning up the Internet. This weekend alone stars like Ellen Pompeo and the cast of Grey's Anatomy, Iggy Azalea, Jennifer Lopez, and The Vampire Diaries star Nina Dobrev, got in on the action.

While we are counting down the days until Grey's Anatomy returns, we know that the cast is hard at work on the ABC medical drama, as they posted their ALS video from the set of the series. Stars including Ellen Pompeo, Jesse Williams, Sara Ramirez, and Jessica Capshaw all took time out from filming to dump huge buckets of chilly ice water over their heads.

Pompeo posted the video to her Instagram account and challenged her ABC TGIT partners, the cast of Scandal and the cast of the new drama How To Get Away With Murder.

Watch The Cast Of Once Upon A TIme Take Ice Bucket Challenge.

Aussie hip-hop star, Iggy Azalea took to her Instagram page to show her fund raising spirit and got drenched with garbage can full of ice water as she wore a neon bikini. She in turn challenged "Black Widow" collaborator Rita Ora and her 'Fancy" duet partner, Charlie XCX to take the challenge next.

Jennifer Lopez, who was actually the one to originally nominate Iggy, also decided to nominate her musical collaborators as she take the opportunity to call out Pitbull and her bestie Leah Remini.

Nina Dobrev went for the slow-motion effect as she got doused with ice relaxing on a boat. As soon as the ice hit her body, she jumped over the side of the boat hoping to warm up in the water below. She called out her friends Julianne Hough and Riawna Capri.

[Image courtesy of Ellen Pompeo's Instagram]