The bubbly Just Married star will make her return to the big screen in the film after taking two years off to nurse her sick mum.
She says, "My mom had cancer and she's doing incredible now."
Stallone will direct and star in the film, which will also feature martial arts star Jet Li, Eric Roberts, Brit Jason Statham and Terry Crews, who has replaced rapper 50 Cent in the movie, which revolves around a group of mercenaries who set out to overthrow a South American dictator.
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