Olivia Wilde poured a bucket of breast milk over her head last night (23.08.14).
The 30-year-old actress - who has a four-month-old son Otis with her fiancé Jason Sudeikis - put her own spin on the ALS Ice Bucket Challenge, which is normally completed with water, by dousing herself with icy milk.
In a video clip posted on YouTube by her fiancé, Olivia said to the camera: "I hope it's ok, I couldn't find any water so I'm going to use breast milk."
She added: "It took me all night to make this."
The brunette beauty nominated "Cory Booker, Gloria Steinem and the artist currently known as Prince," to take part in the challenge, which aims to raise money and awareness for Lou Gehrig's disease.
Olivia was then seen picking up the bucket filled with the white fluid and ice cubes before tipping the contents of it over the head in one smooth motion.
Meanwhile, the stunning star, who was photographed breastfeeding her son for Glamour magazine, recently admitted feeding Otis has become part of her identity.
She said: "Being shot with Otis is so perfect because any portrait of me right now isn't complete without my identity as a mother being a part of that. Breastfeeding is the most natural thing."
The actress added: "I don't know, now it feels like Otis should always be on my breast."