The Queen reacted with disdain to the German President Joachim Gauck's gift of a painting of her and her father (Getty)
The highly stylised picture depicted a young Princess Elizabeth on a blue pony with flecks of yellow and green, with her father George VI holding the reins.
“That’s a funny colour for a horse,” said the Queen, who probably knows as much about equine matters as anyone alive.
The original photograph the painting was based on (Royal Collection)
The monarch also struggled to identify the second figure in the portrait and asked President Gauck: “Is that supposed to be my father?”
The good-natured conversation carried on and Mr Gauck said: “Don't you recognise him?” The Queen replied: “No.”
The Queen and German President Joachim Gauck meet pupils outside Schloss Bellevue Palace (Getty)
The painting, commissioned to mark the visit, was produced from a photograph taken in 1930. It shows the Queen seated on her first Shetland pony, Peggy, a fourth birthday gift from her grandfather, George V.
• An art critic's verdict: 'grotesque kitsch'
Miss Leidenfrost, 41, who is based in Wedel, near Hamburg, said it was a “big honour” for her painting to be presented to the Queen.
Nicole Leidenfrost with one of her paintings
Explaining the blue pony, she said: “I had the idea to make something really special for the Queen. I was looking on the internet for photographs and I found one of the Queen on a pony as a little girl. It was so cute and heart-warming.
“The photo was in black and white so for me it was a nice idea to do everything in colour.
“I always like to paint with bright colours and this pony is royal blue for a royal horse – that is the joke!”
The President was giving the Queen an official welcome to Germany at his official residence, the Bellevue Palace, in Berlin.
The Queen reviews a guard of honour with German President Joachim Gauck at Schloss Bellevue (Sean Gallup/Getty)
The Duke of Edinburgh received a more traditional gift of an 18th century map of Europe and the couple were also given some luxury marzipan.
• Queen beams as she meets Angela Merkel
• Gallery: The Queen's visit to Germany
In return, the Queen and Duke gave the president Briefe eines Verstorbenen, a four-volume set of the early 19th century letters of German nobleman Prince Hermann von Puckler-Muskau chronicling his journey around England, Wales, Ireland and France.
• What Germans really think of British royal family
• Queen's visit recalls Albert and Victoria in Coburg
The President’s partner Daniela Schadt was given a pair of candlesticks.