Kate Middleton jokes she wants 'more babies' with Prince William as she wows in Polish designer gown

The Duke and Duchess of Cambridge have made quite the impression since touching down in Warsaw for their five-day tour of Poland and Germany in what is seen as a bid to strengthen ties with Europe before Britain leaves the EU.

Accompanied on the trip by their children Prince George, 3, and Princess Charlotte, 2, Kate and William spent their first evening (18 July) with Polish president Andrzej Duda and his wife First Lady Agata Kornhauser-Duda - without their little ones - and attended a party in the Queen's honour hosted by the British Ambassador.

35-year-old Kate was overheard joking that she would like to expand her brood after being offered a cuddly toy designed for small babies during a reception in Warsaw.

She was heard saying thank you for the gift during the event for start-up companies before turning to husband William and laughing: "We will just have to have more babies."

The royal couple later rubbed shoulders with stars including model Joanna Krupa at a garden party where Kate looked every inch a future Queen in a custom-made ivory gown by Polish designer Gosia Baczynska – who is known as the 'tsarina of the Polish fashion scene.'

The gown featured Kate's favourite detail of late – a plunging neckline – similar to the Marchesa gown she wore to meet Queen Letizia and King Felipe of Spain at Buckingham Palace last week.

The monochrome design of last night's dress featured a fashion forward black piping and a leaf-designed waist belt which she paired with strappy black heels by Gianvito Rossi. She put a classic twist on the look by adding a pearl necklace with matching pearl earrings while pulling her hair back into a demure updo.

Baczynska is known for her bold designs and was famously the first Polish designer to feature in the Paris fashion week calender.

William, also 35, received a great reception by the crowd at the event when he addressed them in Polish by saying: "Good evening, we hope you have a nice party."

He also went on to commend the country's "courage, fortitude and bravery" in surviving centuries of assaults including its "incredible bravery" during the brutal World War II Nazi occupation.