The Duchess of Cambridge has loved seeing her children fall in love with nature.

Duchess of Cambridge

Duchess of Cambridge

The 35-year-old royal made reference to her two children - Prince George, three, and Princess Charlotte, two - in a speech she gave to mark the reopening of Hintze Hall at the Natural History Museum in London.

During her speech, the Duchess explained: "Like many of you here tonight, I remember visiting the Natural History Museum as a child, and being inspired with a love of nature.

"And now, as a parent myself, I am experiencing the joy all over again with my own children, who adore coming here, and it is not just to see the T-Rex mind you.

"Who could fail to be inspired standing here in this wonderful hall."

This comes shortly after tennis legend Andre Agassi described the Duchess as a "real sweetheart".

Agassi sat next to the British royal during the 2012 Wimbledon Championships and has fond memories of his meeting with the Duchess.

The retired sports star, who is married to Grand Slam-winning champion Steffi Graf, shared: "We sat next to each other and watched the semi-finals about five years ago.

"She's a sweetheart of a lady. She's a real sweetheart."

Later, Agassi added: "I don't know her well and quite honestly I don't get the whole royalty thing - in the sense that they're celebrities on steroids or something.

"I can empathise with some of that, but it's fascinating to watch from the outside. You have to be on your game all the time!"