The movie takes place on a small Scottish island where Hollywood actress Lara Tyler (Alice Eve) is about to get married to James Arber (Tennant).
With the world's media sensing a big scoop, the pair hire a stand-in bride (Kelly Macdonald) hoping to stop the paparazzi from ruining the ceremony.
Smack the Pony's Sally Phillips and Neil Jaworski penned the script for the film, which is directed by Sheree Folkson. Phillips, Dylan Moran, Ugly Betty's Michael Urie and James Fleet are among the supporting cast.
The Decoy Bride will debut in cinemas on March 9 followed by a DVD release on March 12.