The 39-year-old actor, who reprises her role as Neytiri in the follow-ups to the 2009 blockbuster hit, wrapped filming on June 8, Deadline reported.
Lightstorm Entertainment's Jon Landau, who is co-producing with director James Cameron, made the revelation at a Fox presentation at CineEurope.
Landau also confirmed that they are in the middle of production and noted that the element of water "plays a huge part" in the movies. He also said that the sequels will feature "never before seen parts of Pandora".
Cameron, who was also present at the event, added that the early results on the films "are beyond even our expectations".
The third installment will be followed by a three-year break for "Avatar 4, set for December 20, 2024. "Avatar 5" will then open on December 19, 2025.
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