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Brit actress Helena Bonham Carter has been spotted on set, reprising her role of Bellatrix Lestrange for the project.
A source told The Sun that 'the cast have really enjoyed getting back together - they are so tight-knit'.
"The shooting schedule is nowhere near as long as the films, so though filming has been intense, the stars have enjoyed being able to pop in and out," the source added.
They're set to open in 2014 and 2016.
The final film in the Potter series, "Harry Potter and the Deathly Hallows Part Two", was released in July 2011.Related Video: Harry Potter - The Special Effects