This news arrives via Deadline, which also adds that Jennifer Coolidge and Sonia Braga are onboard to play Duhamel and Lopez's onscreen mothers.
Cameras are primed for filming any time now.
Pleased to finalise Duhamel's deal, Lionsgate's president of production Erin Westerman commented: "We couldn't be happier for our bride and groom of this Shotgun Wedding.
"We know Josh and Jennifer will make a compelling and sexy onscreen couple and they will be fun sparring partners as their dream destination wedding erupts into a memorable nightmare.
"We are also thrilled to bring Jennifer and Sonia on to our cast as Mothers of the Bride and Groom. Their acting and comedic talents will add another fun layer to this already-rich action-comedy."
The Social Network actor Armie Hammer originally landed the part of Tom, but decided to drop out amidst a personal controversy surrounding unverified explicit messages, which he has denied.
A spokesperson for the project stated last month: "Given the imminent start date of Shotgun Wedding, Armie has requested to step away from the film and we support him in his decision."
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