26 December 2010 at 12:26 GMT
The role of young Severus Snape in Harry Potter and the Deathly Hallows: Part 2 will be played by 14-year-old Benedict Clarke.
Additionally, 13-year-old Bertie Gilbert will play the role of Scorpius Malfoy (son of Draco) in the epilogue sequence, which was shot at Leavesden Studios over Christmas.
Earlier this year the names of actors playing various other younger characters in this sequence were revealed.
With thanks to SnitchSeeker.