The actor from the Sutton area, who is now 17, cannot be named for legal reasons. He is accused of orally raping a 14-year-old boy at Wimbledon Theatre in July 2010.
He has also been charged with two counts of sexual assault at North London's Italia Conti theatre school in September 2010, and an assault by beating at the same place in April 2011.
All charges relate to the same alleged victim.
The actor will appear in court to hear the charges in November.
He had answered police bail yesterday (October 23).