Kate even paired the gown with the same clutch she did 6 years ago.
Prince William also put on a dapper display as he joined his wife on the red carpet.
The couple, who are parents to Prince George, Princess Charlotte and Prince Louis, even shared a joke together as they arrived at the event.
The Duke of Cambridge became Royal Patron of Tusk in December 2005. The Duke has actively supported the charity’s work both privately and publicly on many occasions and recently visited Tusk projects in Namibia and Tanzania.
Tusk has pioneered successful conservation action in Africa for almost thirty years by protecting wildlife, empowering communities and advancing the frontline in the fight against the illegal wildlife trade.
The annual Tusk Conservation Awards celebrate the achievements of extraordinary people, whose work protecting Africa’s natural heritage might otherwise go unnoticed outside their fields.