At the party, William and Kate chat with guests at the British Ambassadorial Residence.
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During a visit to Strassenkinder, a German charity that supports disadvantaged young people, William and Kate pose with a group of smiling kids..
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Kate gets a big hug from a little boy who is clearly a big fan — he's holding a photo of her!
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Arriving at the Chancellery in Berlin, Prince William and Princess Kate chat with Chancellor Angela Merkel.
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The royal couple walks through the Memorial to the Murdered Jews of Europe, a Holocaust memorial in Berlin.
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William and Kate stand in front of the Brandenburg Gate, one of Berlin's best-known landmarks.
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Kate receives a gift — a poster with a photo of her and William and welcome wishes on it — from a member of the crowd in Berlin.
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Prince George shows off his handshake just after arriving in Berlin.
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Charlotte gets her first bouquet! The little royal holds a teeny-tiny bunch of flowers — that perfectly match her mom's larger one!
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Someone isn't a fan of early wakeup calls! Prince George sleepily rubs his eyes on the tarmac in Berlin.
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William, Kate, George and Charlotte all hold hands upon arriving in Berlin for the second leg of their European visit.
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Bottoms up! Kate samples "fire water," a traditional Polish liqueur with flecks of gold in it.
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Crowds clamor for a snap of the royal couple.
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Inside the Gdansk Shakespeare Theatre, William and Kate greet actors in an array of costumes.
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In Gdansk, Poland, William greets some costumed characters in the town market square.
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William signs a book as Kate looks on during their visit to Stutthof.
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In a solemn moment, they stand in front of a statue of the Star of David at Stutthof.
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On the second day of their Polish visit, William and Kate spent the morning at Stutthof, a former Nazi concentration camp. While there, they met with Holocaust survivors who were returning to the camp for the first time since World War II ended.
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Will and Kate smile with drinks in hand at the garden party.
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Quick change! For the Queen's Birthday Garden party at The Orangery, in Warsaw's Łazienki Park, Kate wears a new white dress, by Polish designer Gosia Baczynska.
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William tries on a pair of virtual reality googles at a Tech Market event today for Polish Business.
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Inside the Warsaw Rising Museum, Kate speaks with World War II veterans.
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William and President Duda light candles outside of the Museum.
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After leaving the Presidential Palace, the two couples walk along the Memorial Wall to victims of the Warsaw Uprising, outside of the Warsaw Uprising museum.
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Inside the Presidential Palace, William and Kate have lunch with the President, First Lady and other guests.
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The two couples — Prince William and Kate and President of Poland Andrzej Duda and the first Lady Agata Kornhauser-Duda — wave to the crowds while posing outside of the Presidential Palace in Warsaw.
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Kate smiles with a bouquet of flowers while greeting a young girl in Warsaw.
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Princess Kate greets children who lined the streets of Warsaw, equipped with Union Jacks and Polish flags, with First Lady Agata Kornhauser-Duda.
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George is not impressed! The little royal showed off his adorable pout after landing in Warsaw.
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Charlotte, in a red floral dress, gets a lift (and a smile!) from mom Kate.
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Gang's all here! The family of four makes their way across the tarmac after arriving in Warsaw. They'll spend two days in Poland and three in Germany during the visit.