After the death of her father from a heart attack, when she was 16, Olivia joined the British Heart Foundation as one of five officially appointed female Ambassadors in 2019, alongside Pippa Middleton, Sarah Ferguson the Duchess of York, Dame Esther Rantzen and Dr Hazel Wallace.

[19][20][21] During her career, Arben has fronted campaigns for brands including Roja Parfums,[22] Cartier, L'Oréal,[23] Triangl Swim, Joshua Kane Bespoke, Steve Madden, Harvey Nichols, Timberland, Needle & Thread,[24] Juicy Couture, Pronovias, Rami Kadi, The Deck,[25] and NFL Europe Super Bowl 2017 EU Clothing Campaign,[26][27][28][29] Olivia's first brand collaboration, Olivia Arben X Terry De Havilland, The Rebel Collection was launched October 2022.

[31] Arben has walked London, New York, Paris & Berlin Fashion week for designers such as Cartier, Rami Kadi, Malan Breton, Roland Mouret, Hervé Léger, Atelier Zuhra, Joshua Kane and Jean Gritsfedlt.

[32] Arben has been shot by notable photographers including Ellen Von Unwerth, Rankin, Branislav Simoncik and Luis Monteiro.

[23] On 19 May 2019 Olivia got engaged to her long-term boyfriend Nico Cary, an entrepreneur, at Hôtel du Cap Eden Roc during the Cannes Film Festival.