Peter Facinelli, who plays Carlisle Cullen in the series, advised fans to stay in their seats after Breaking Dawn - Part 1 ends through his Twitter account.
"Make sure you stick around after the credits in #breakingdawn. There's another scene," he wrote.
Watch Breaking Dawn stars Robert Pattinson, Kristen Stewart and Taylor Lautner talk Twilight with Digital Spy below:
Twilight fans have taken to Twitter to tease the hidden sequence, which will reportedly feature actor Charlie Bewley and the Volturi vampire clan led by Michael Sheen.
TheHostMovie wrote: "A lot of Breaking Dawn advanced screenings start today. Make sure to stay after the credits for a Volturi scene with @alchemission."
The Twilight Saga: Breaking Dawn - Part 1 is released in cinemas worldwide on November 18, followed by Breaking Dawn - Part 2 on November 16, 2012.
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View our Twilight: Breaking Dawn premiere gallery below: