The designers have used elements from the drink's company's limited edition chalice in their ideas for Olivia's gown, with the shimmer, gold accents and silhouette proving a source of inspiration, and their finished creation will incorporate one-of-a-kind glass beads made from the chalices.

Keren said: "We wanted to use the red carpet as a platform to get this important message across.

"So when we started designing we asked ourselves, 'how can we make a celebrity dresses for Olivia that's beautiful, Oscar-worthy, and yet still really shines a light on this cause?'"

They then 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.

She told Celebuzz: "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 will be "fairytale"-like.

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

For every limited-edition chalice sold, Stella Artois will assist Water.org in providing five years of clean water for one person in the developing world.