Prince George and Princess Charlotte have started learning how to ride a bike.

The Cambridges

The Cambridges

The royal children's mother, Duchess Catherine, told professional cyclist Frank Schleck at a cycling festival in Luxembourg on Thursday (11.05.17) that her two little ones - who she has with husband Prince William - are just getting to grips with how to use a bicycle and how much they love going out in the sunshine on their own bikes.

According to Hello! magazine, he said: "We talked about how they [children] really appreciate riding a bike. For kids, it's great because they can exercise and - as long as it's safe - go to school without their parents.

"She said their kids have bikes and that they're always excited about trying to ride."

Earlier in the day, the brunette beauty startled a "shy" young boy as he gifted her a bouquet of flowers during her trip.

The 35-year-old royal spoke with three-year-oold Teo Schleck's mother who said her son hid his face because he was probably anxious about meeting a new person.

According to PEOPLE, the mum told reporters: "Catherine asked if he was shy.

"She was very nice--you can see she's a mom."

Catherine - who has three-year-old Prince George and 24-month-old daughter Princess Charlotte with husband Prince William - stunned in an elegant eggshell coat during her visit to the European city.

A video was shared on the official Kensington Palace Twitter account, which showed the brunette beauty walking around the Grand Duke Jean Museum of Modern Art where she was given a guided tour of two exhibitions by British artists Sir Tony Cragg and Daren Almond.

The clip was captioned: "Today's visit by The Duchess started with a tour of the current exhibitions by British artists Sir Tony Cragg and Darren Almond at the Grand Duke Jean Museum of Modern Art. The Duchess then attended a reception and met with leading young Luxembourgers in the fields of culture, education, business and the charitable sector #RoyalVisitLux (sic)"