Olivia Wilde uses breast milk for ALS Ice Bucket Challenge

New mum Olivia Wilde put her own spin on the ALS Ice Bucket Challenge by dousing herself with a pale full of breast milk.

The Tron: Legacy star was nominated to participate in the charity challenge by actor Ty Simpkins and actress Dianna Agron and she has since elected New Jersey Senator Cory Booker, women's rights advocate Gloria Steinem and Prince to take part in the campaign.

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

Meanwhile, Wilde's fiance, Jason Sudeikis accepted the challenge from former presidential nominee Mitt Romney and was soaked with ice cold water for almost a minute.

An army of stars, including Wilde's Rush co-star Chris Hemsworth and her In Time castmate Justin Timberlake, have taken the freezing water challenge to raise cash and awareness for the ALS Association.