The British singer-turned-actor has been cast in "Wolves of War", in which he and Westwick will play British officers leading a team of Allied commandos on a World War Two mission to free an American held hostage by the Nazis in Bavaria, reports Deadline.com.
"Sherlock" 's Rupert Graves will play the prisoner in director Giles Alderson's new project, which is based on a true story.
Production began in the U.K. on Friday (18Jun21).
The movie marks Willis' second war outing onscreen - he also appeared in 2014 film "Allies".
His only other film credit is in 2019 comedy "Madness in the Method" while he previously tested his acting skills in U.K. soap opera "EastEnders" and British sitcom "Birds of a Feather".
Willis will play Dr Pomatter, joining the likes Lucie Jones as Jenna, Sandra Marvin as Becky, Evelyn Hoskins as Dawn, George Crawford as Ogie, Tamlyn Henderson as Earl, and Christopher D. Hunt as Cal.
An adaptation of 2007 movie of the same title, "Waitress" premiered at the Brooks Atkinson Theatre on Broadway in 2016 with Jessie Mueller as the leading lady before it branched out to U.K. in 2019.