After learning of their shared love of chicken nuggets, Prince Harry cheekily asked the Olympic champion Usain Bolt whether he worked out.
The princes made royal internet history as they appeared for a live question and answer session today.
Prince Harry had to call upon his best dance moves while visiting a centre for disabled children in Chile.
Prince Harry watched the World Cup football match between Cameroon and Brazil at the Brasilia national stadium tonight.
The fourth in line to the throne was surrounded by officials at the Brasilia national stadium on the first day of his week-long visit to Brazil and Chile.
Prince Harry went on a canoe ride with a doctor and a patient with neurological problems while visiting a hospital in Brasilia.
The fourth in line to the throne began his seven-day trip to Brazil and Chile today and is expected to attend a World Cup match between Brazil and Cameroon later.
Prince Harry began his seven-day trip to Brazil by visiting a hospital in the country's capital Brasilia.The fourth in line to the throne watched patients with neurological problems playing wheelchair basketball to aid their recovery.
The prince visited the Brasilia branch of the Sarah network of rehabilitation hospitals which has 10 units across the country.
During his seven-day trip to Brazil and Chile, Harry is expected to carry out a range of engagements from visiting rain forests to paying tribute to the military achievements of both nations.
The Prince is due to attend World Cup game between Cameroon and Brazil World Cup tonight.
Prince William and Prince Harry were back at the polo pitch today, playing a charity match in Coworth Park near Ascot in Berkshire.
The annual charity event in support of charities including the Royal Marsdencancer hospital, HIV fund Sentebale and youth training charity Skillforce.
Prince Harry will be in the stands to watch England's potentially crucial final World Cup group game against Costa Rica.
Harry will join thousands of fans at the Estadio Mineirao in Belo Horizonte on 24 June during his seven-day tour of Brazil and Chile.
The prince will also watch World Cup hosts Brazil take on Cameroon in the capital Brasilia when he arrives in Brazil on 23 June.
His itinerary will also take him to Brazil's largest city Sao Paulo before he carries out engagements in and around Chile's capital Sanitago and the city of Valparaiso during the final three days of the trip.
Prince Harry threw himself into training as he joined children at a community event in Suffolk.
The prince was visiting a community project in Ipswich and donned tracksuit bottoms and an England rugby polo shirt for the occasion.
During the visit to Inspire Suffolk, Harry, a well-known rugby fan and vice patron of the Rugby Football Union, went on to join in a football kick-around.
Veterans of the Battle of Monte Cassino gathered alongside Prince Harry today to mark 70 years since one of the costliest battles of the Second World War.
While Harry praised their courage, one veteran of the Italian assaults told ITV News: "I never thought I would come out of it alive".
ITV News Royal Editor Tim Ewart reports:
Prince Harry has told ITV News it "makes no sense at all" that the Battle of Monte Cassino is referred to by some as the "forgotten campaign" - insisting the veterans of one of the Second World War's bloodiest battles deserve "as much recognition" as anyone else that served in the conflict.
Speaking to Royal Editor Tim Ewart at the site of the assaults, Harry praised the heroism of those who fought for months on end "knowing that they were going to lose most of their friends and probably themselves as well".