Olivia Culpo believes "fashion for a good cause" is the "best".

Olivia Culpo at the 89th Academy Awards

Olivia Culpo at the 89th Academy Awards

The 24-year-old model-and-actress adorned a custom creation from Marchesa designers, Georgina Chapman and Keren Craig, at the 89th Academy Awards on Sunday (26.02.17) with the gown helping to raise awareness for Stella Artois and Water.org's campaign to bring clean water to developing countries.

And the 'The Other woman' star was amazed with the innovative design and the fact she was wearing one-of-a-kind beads made from the beverage brand, which will help to provide five years worth of clean water to people living in developing countries.

Alongside a video of the brunette beauty swinging around in the unique gown, which she posted on her Instagram account, she wrote: "I still can't believe that the beads on this dress are made from @stellaartois Limited-Edition Chalices! Each one sold helps @water provide five years of clean water to someone in the developing world. Fashion for a good cause is the best kind of fashion :) #oscarsredcarpet #1Chalice5Years#sponsored (sic)."

The creative masterminds they spent three months talking to the former Miss Universe about their idea, and came up with three possible designs and Olivia was delighted to be involved in the campaign.

Speaking previously, Keren said: "I always like to try something new on the red carpet and this is such meaningful way to do it. The fact that it's going to help provide water for people across the world is incredible."

Olivia refused to reveal which of the three designs she has chosen for the event but promised it would be "fairytale"-like.

She said: "It's easy to pinpoint a Marchesa dress because it's always ethereal, whimsical, and looks like it's almost out of a fairytale."

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