The Duke and Duchess of Cambridge may already have their hands full with George and Charlotte - but Kate has hinted she'd like a third after being given a gift designed for newborns.

According to the Daily Mail, Kate speculated about having another child after she was offered a cuddly toy designed to soothe tiny babies during a reception in Warsaw.

Saying thank you for the present during the business event on Monday Kate turned to her husband, laughing, and said: "We will just have to have more babies."

Later the pair rubbed shoulders with stars including model Joanna Krupa at a garden party where the Duchess wore a dress with a plunging neckline by Polish designer Gosia Baczynska.

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Miss Baczynska, who is known for her bold designs, was famously the first Polish designer to feature in the Paris fashion week calendar.

Commenting on Kate's earlier baby remark, Julia Sielicka-Jastrzebska, who founded the company with her sister, said that Kate made the joke after learning the bears were designed for children younger than George, four and Charlotte, two.

"We gave the Duchess some presents for Prince George and Princess Charlotte," she said.

"She said they should have more babies, and they laughed."

The Duke and Duchess were visiting The Heart, an incubator for digital and tech start-ups in the Polish capital, on the first day of their Poland and Germany tour - seen by many as a Brexit charm offensive.

Later the couple, who touched down in Warsaw on Monday afternoon, were among 600 guests attending a party held in the Queen's honour at the Orangery in picturesque Łazienki Park, hosted by the British Ambassador Jonathan Knott.

Kate arriving at Warsaw Rising Museum in Poland. Photo / Getty
Kate arriving at Warsaw Rising Museum in Poland. Photo / Getty

William was clapped and cheered by the crowd tonight as he addressed them in faltering Polish to say "good evening, we hope you have a nice party."

Standing beside Polish President Andrzej Duda and his wife Agata, William also hailed the country's "courage, fortitude and bravery" in surviving centuries of assaults, and especially its "incredible bravery" during the brutal WWII Nazi occupation.

And he read a message from the Queen which highlighted the close ties between Poland and Britain which stretch back 1,000 years.

William and Kate were met several leading Polish dignitaries at the party held at the Orangery in Warsaw's Lazienki Park which was the residence of king Stanislaw, the last king of Poland.

Guests enjoyed English white wine and smoked salmon sandwiches served with mini Union flags stuck into them.

They were also treated to a performance from the String Quartet of the National Polish Radio Sympathy Orchestra, led by UK raised Polish national Rafal Zambrzycki-Payne, a former BBC young musician of the year.

The monarch's birthday falls in April but is officially celebrated in the UK in June - while Poland declared independence in 1918, becoming a parliamentary republican authority.

During the event, the Duke made a speech on behalf of his grandmother, who turned 91 earlier this year and has started officially delegating royal duties to younger royals like Kate, William and Harry.

Duchess of Cambridge, Prince William, Prince George and Princess Charlotte arrive at the airport during an official visit to Poland and Germany. Photo / Getty
Duchess of Cambridge, Prince William, Prince George and Princess Charlotte arrive at the airport during an official visit to Poland and Germany. Photo / Getty

The party marks the end of the couple's whistle-stop tour of Warsaw, and tomorrow they will travel on to Stutthof concentration camp and Gdansk's shipyards, before heading to Germany later on in the week.

On their first official visit to Poland the couple are accompanied by their children, Prince George, who will be four on Saturday, and Princess Charlotte, two.

Earlier, the Duke and Duchess received a rapturous welcome from crowds who lined the streets of the Polish capital in the hope of catching a glimpse of the royal visitors, bearing gifts, bunches of flowers and even a sign saying: "We love William and Kate".

One well-wisher, 21-year-old student Magda Mordaka, told how the Duchess shrugged off a compliment from adoring fans - insisting that she is not "beautiful".

Magda said: "We were telling her that she is beautiful and perfect, but she said it's not true - it's just the make-up."

After lunch the royal couple were greeted by a huge crowd waving British and Polish flags and taking photos, as they took a brief walk in front of the palace.