The festive rom-com, which is directed by Jonah Feingold and written by Dan Steele, will see the pair as exes who fight for their place on Christmas Day.
The logline for the new film, which is due to be released on November 17, reads: "When Graham (Amell) decides to surprise his family by travelling home for Christmas, he is shocked to discover them already celebrating with an unexpected guest of honour, his ex-fiancée, Ali (Meester).
"The two exes battle it out to see who the family will pick to stay through Christmas Day and who must go. Let the holiday chaos begin!"
In the trailer we see the duo battle it out with a series of comedic shenanigans, but they ultimately come to realise just where they went wrong in their relationship. Whilst the passion of their feud eventually turns into passion of another kind, whether the two decide to make another go of their relationship in the end remains to be seen.
Meester, who is best known for her role as Blair Waldorf on hit teen drama Gossip Girl, also stars in direct-to-video feature River Wild alongside her husband Adam Brody. The film was released earlier this year and serves as a standalone sequel to 1994's The River Wild, which starred Meryl Streep, Kevin Bacon and John C Reilly.
The couple play friends who become stranded in raging rapids whilst on a whitewater rafting adventure.
EXmas will be released in the US on Amazon Freevee on November 17; there is currently no UK release date.
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