Reece from London, who is about to turn 12, plays the series regular role of Mo in CBBC's The Dumping Ground and attends Young and Talented theatre school.
David Walliams and Miranda Hart appear as Ben’s Strictly Come Dancing obsessed parents, Mike & Linda.
Ben is bored beyond belief after he is made to stay at the house of his grandma: all she ever wants to do is stay in, play Scrabble, and eat cabbage soup.
Until one day, when Ben’s grandma tells him a story that she was once an international jewel thief, and together they go on a wild adventure to complete the one heist she never quite managed in her criminal heyday – which brings them face-to-face with Her Majesty The Queen, played by Joanna Lumley.
Rob Brydon plays Mr Parker – a nosy neighbour who could scupper Ben and his grandma’s plot.
David Walliams says: “I am thrilled that we have such a stellar cast of comedy legends for Gangsta Granny. I can only apologise that I am in it too!”
Gangsta Granny will be directed by Matt Lipsey and begins filming on Sunday, for broadcast this Christmas on BBC One, following on from the success of last Christmas's Mr Stink.