Meghan Markle held her nerves through a nominations mix-up at a ceremony celebrating injured servicemen and women.
Ms Markle laughed and smiled on stage as her co-presenter struggled with a winning envelope at the Endeavour Fund Awards.
The American presented a number of awards alongside Prince Harry at the annual event in central London on Thursday.
"I'm truly privileged to be here," she said on presenting two of three awards to Daniel Claricoates.
Mr Claricoates, who developed PTSD after serving in Afghanistan, has since climbed the highest mountains in both Africa and Antarctica with the organisation 65 Degrees North.
The top honour of the night is named after the late explorer Henry Worsley, who died in January 2016, just 30 miles from completing a solo crossing of the Antarctic while raising money for the Endeavour Fund on the expedition.
"It is a complete honour and he would not have believed it at all," said Worsley's son, Max.
"For him to be continuing to inspire all of these people - It's huge."
Harry joined Max, and his sister, Alicia, on stage to present the award named in their late father's honour.
The prince said: "I am fortunate enough to meet many of those who take part in the endeavours that we support and I am continually amazed by the tenacity, fortitude and unshakeable humour displayed by the men and women who sign up to run races, cross oceans, climb mountains or take on challenges few would even contemplate."
They simply couldn't have achieved it without the support of a team - whether their teammates or their family at home - it is teamwork that has carried them through."
Harry and his bride-to-be looked relaxed earlier in the evening as they talked with the nine nominees - who have each taken part in remarkable sporting and adventure challenges.
Former Royal Marine Dan Fielding, 37, said having the couple attend the awards, which are already "the Oscars", was "massive."
"It's lovely he's brought his new fiancee with him," said Fielding, who last year captained a 2,000-mile voyage around the British Isles with a crew of 17 other veterans.
"She talks so well, she's so caring, so kind, so nice. She is very genuine, very natural. When you see them together, they look absolutely fantastic. I asked if she wanted to come sailing with us. She smiled nicely and nodded."
He added: "It would be nice if she would come sailing, but it might be too cold for her over here."