Olivia Wilde does ALS challenge with breast milk: VIDEO

New mother Olivia Wilde joined the growing ranks of celebrities who have taken the ALS Ice Bucket Challenge, but she decided to do it her way: with icy breast milk.

"I hope it's OK, I couldn't find any water, so I'm going to use breast milk," she said in a video posted on YouTube. "Took me all night to make this."

She then tips the bucket of milk over her head, squealing "It really is cold!"

Even though she didn't use water the actress put ice in her milk so it would properly count, and from the look of things at the end of the clip she definitely didn't skimp on it.

Wilde also nominated a New York senator, a feminist, and Prince.

 "I would like to nominate Cory Booker, Gloria Steinem and the artist currently known as Prince."

In case anyone might have believed that it really was breastmilk, she took to Twitter to clear up the confusion.

"Oh wait some of you thought that was really breast milk? Oh dear," she tweeted.

"Uh thank you? But my boobs aren't that generous. Ha ha."

Wilde is a new mom and is currently breastfeeding her adorably son Otis. In her shoot for Glamour Magazine's September issue, Wilde posed in a sequined dress while breastfeeding her nude son.

Wilde tweeted one of the photographs from the shoot, saying that not everything had gone to plan.

"Otis ordered milkshakes. Luckily I had some on me. Then he peed on my dress. Good Kid," Wilde tweeted.