The Duchess of Cambridge stepped out in an elegant aqua green floor-length gown alongside Prince William for the Tusk Conservation Awards on Thursday night.
William was due to present awards to three "extraordinary people" for their conservation work and bravery protecting Africa's wildlife and natural heritage at the ceremony in London.
The duke will present the Tusk award for conservation, Tusk wildlife ranger award and the Prince William award for conservation in Africa to the winners.
The charity was set up in 1990 by its current chief executive Charles Mayhew MBE to protect African wildlife against threats including poaching, habitat loss and human-wildlife conflict.
The duke became a patron of Tusk in 2005 and has supported the charity's work privately and publicly, including visiting its projects in Namibia and Tanzania on his recent tour of Africa.
He also visited projects in Kenya on his week-long tour before returning to the UK at the beginning of October.
Last year, William said the annual awards mean a great deal to him personally and play a huge part in preserving the continent's wildlife.
He added: "These awards, which mean a great deal to me personally, play a huge part in our mission to preserve Africa's precious wildlife for its people.
"It is vital that we recognise the dedication of these unsung heroes and the bravery of rangers risking their lives, day and night, on conservation's front line. We all owe them a huge debt of gratitude."
Reporting by Press Association
