The former soap actress, 36, takes on her sauciest ever role as blood-thirsty character Alex in new scary movie Habit.
The film, which is released on DVD next week, sees the star wear a corset and lick a bloody knife in a sultry manner.
In images released from the movie, Roxanne appears to murder a client.
Her character works at a brothel which is a cover for flesh-eating killers.
A doorman called Michael, played by Elliot Langdridge, soon discovers the horrifying events taking place at the establishment.
It comes just months after Roxanne became the third female contestant to quit Bear Grylls’ Celebrity Island.
The actress joined Love Island’s Montana Brown and journalist Paris Lees in throwing in the towel just days before filming began.
In November, the star confronted two boys she claims "ridiculed and harassed" her in an awkward row on a train.
She started filming the pair after they reportedly started talking about her within earshot.
While it's not clear what the boys said, Roxanne was clearly annoyed, saying at the start of the video: "People are afraid to say hello so they talk about you not to you."
The boys tried to ignore her as she continued to film them, before one said: "You've not been relevant for years anyway."
But the 34-year-old was having none of it, replying: "Really? Relevant enough for you to sit down next to me and talk about me, to me."
Roxanne, who played Jo Sugden in the soap from 2005 to 2009, then moved along the carriage so she was stood in front of the pair as they sat at a table seat on the train.
As they continued to exchange words, the other passengers remained silent and kept their heads down.
The actress then told them that every person was relevant, before one of the boys asked why she was filming him.
She replied: "Because I'm documenting the harassment you've given to me since you sat down."
The boy denied doing anything, but Roxanne was then backed up by a female passenger sitting across the aisle.
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