Prince Harry and the Duke of Cambridge on the trading floor during the BGC Partners Charity Day in London's Docklands
The Duke of Cambridge and Prince Harry cracked jokes with each other as they made multibillion-pound deals for charity on a City trading floor today.
As the brothers brokered big-figure trades they shouted remarks at one another, and Prince Harry ribbed his brother, who is a new father, for being preoccupied with "baby chat".
The Princes were at brokerage firm BGC Partners in London's Docklands to raise money in memory of people who died in the attacks on New York's Twin Towers on September 11 2001.
Prince Harry remarked to traders about his brother: "He's on the phone and it's all baby chat."
He then turned to The Duke and said: "Stop flirting, get on with it!"
One broker, Neil Fordham, called The Duke a "natural" on the telephone.
"He even made a bit of a joke," the 45-year-old, from Abridge in Essex, said.
"He said 'It's all a wind-up, I'm Gary'."
Prince Harry talks to Lily-Anne Chart, six, during the BGC Partners Charity Day in London's Docklands
BGC lost 658 employees in the attack on the World Trade Centre 12 years ago, and its annual Charity Day, now in its ninth year, has so far raised more than 89 million dollars.
All profits from the trades during the course of the day are donated to good causes, including The Duke of Cambridge's SkillForce and Prince Harry's WellChild charities.
The Princes each made a handful of high-value deals during their 50-minute visit.
Cautious at first, they soon got into the swing of things as the raucous trading floor buzzed around them.
During one of his deals, Prince Harry urged the trader on the end of the line to put up more money.
"150? Why don't we make that 200?" he said.
The last deal the brothers made was for 25 billion euros - a world record for a forward foreign exchange.
But executive managing director at BGC Xavier Alcan, who listened in on The Duke of Cambridge's phone call, said he did well.
"He was very pleasant and very courteous," he said.
"He was making enough effort to concentrate on the decision."