Carter-J said he was shocked to be offered the part of Harry Plat in Coronation Street earlier this year, and said people around his hometown had started recognising him in the street.
His mother Abbie said: “Being from Manchester anyway, you grow up watching Coronation Street, so when your child gets cast as one of the Platts, it’s just crazy.
“I am really, really proud of him.”
Carter-J said he enjoyed playing the younger Williams as “I am more like him”, adding the experience of attending the premiere was great as there was “loads and loads of famous people”.
When it comes to acting, he said he aimed to “just think what I would feel if I was Robbie, what would he feel like, will he feel this way in this situation.”
The 10-year-old said he now had two weeks off filming Coronation Street for Christmas, and was looking forward to enjoying some downtime after a busy year.