James - who stars in the comedy as Jay Cartwright - uploaded a snapshot of his lines for the film, which will be released in August 2014.
Alongside it, the 25-year-old actor wrote: "Yes I'm very excited over the news! #Inbetweeners2. I hope you are too! Anyway I've got lines to learn ... wanna see??"
Whispers of a sequel to the film spin-off of the hit C4 show have been rife for a while and, earlier today (2 August), creators Iain Morris and Damon Beesley confirmed it.
In a joint statement, they said: "We couldn't be more excited to be making another Inbetweeners movie with Simon, Joe, James and Blake. Frankly it's pathetic how much we've all missed each other."
Iain and Damon added: "A new chapter in the lives of The Inbetweeners feels like the very least we can do to thank the fans for their phenomenal response to the first movie."
The original film, The Inbetweeners Movie, was released in August 2011 and starred James, Simon Bird, Blake Harrison and Joe Thomas.
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