Three-year-old Joshua Sheridan plays the Prince in sketches starring comedy legend Ullman as Camilla and Carole Middleton.
Filmed on location in Hertfordshire, Joshua had great fun playing the Prince – whose Royal relatives cope with babysitting him!
Mum Helen Belper, 36, said: “Tracey Ullman’s back in the UK doing a six-part sketch show of impressions.
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“We got involved because Joshua is with a casting agency, I told them he had a likeness to Prince George and he got the part.”
Helen travelled to the stately set with her dad to help keep Joshua calm during filming in August.
She said: “Joshua was only two at the time but he was actually relaxed and enjoyed being on set.
“I didn’t realise that he was considered a principle in it! He had his own dressing room and a trailer with his name on the door!”
Filming followed strict regulations regarding children – and Joshua was only allowed on set for five hours maximum a day, with filming lasting for no more than 15 minutes at a time.
And as for the big star of the show?
Helen added: “Tracey Ullman was really lovely! I was so relieved because I’d worried that she might be a pre-madonna as she’s quite an important figure, but she was very good with Joshua!”
Joshua is currently with an agency and enjoying working on small modelling jobs.
> The Tracey Ullman Show next airs on BBC One on Monday at 10.45pm.