Prince George has 'grown an extra fat roll' while he has been in New Zealand and Australia, his mum has revealed.
The Duchess of Cambridge told children at a tea party in the shadow of Uluru, or Ayers Rock: "He's been changing so much while we've been away."
And one of the teenagers, Shannon Hunt, 17, added: "Kate also said he grew an extra fat roll while they're away. She said he can get a bit grumpy on the long flights and she'd love to have him with her here."
The Duchess said she was excited about seeing the sun set on Uluru.
She said: "An afternoon with the sunset... It's the most beautiful setting."
The students asked the Duke and Duchess to take a photo with them, initially asking for a selfie, but then settling for a regular snap.
The Duke joked: "Well, If you don't mind having a photograph with us."
Erin Keeley, 17, asked the Duke if he and the Duchess lived at Buckingham Palace and said she had been disappointed at visiting the Palace last summer and not seeing the Queen.
The Duke teased: "That's because she knew you wanted a selfie. She ran away!"
Later, George's parents were presented with a personalised skateboard for their son to add to the haul of gifts he has received during his tour Down Under.
Prince William and Kate were given the present at skate park in Elizabeth, South Australia.
The green skateboard, with 'George' painted on it, was also adorned with the image of two kangaroos and two Australian flags.
Some of the crowd of at least 5,000 called out to the Duke of Cambridge to 'have a go on it' but he politely declined and handed the skateboard to a minder.