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Lily Collins and Jamie Campbell Bower keep it tense in this newly released poster for their latest film Mortal Instruments: City of Bones, which hits theaters on Wednesday, August 21!

The 24-year-old actress and the 24-year-old actor were joined in the poster by Kevin Zegers, Jemima West, and Robert Sheehan.

PHOTOS: Check out the latest pics of Lily Collins

Mortal Instruments: City of Bones centers on “a demon, a seemingly ordinary teenage girl, Clary Fray, who finds out truths about her past and bloodline on her quest to get her back, that changes her entire life.”

Bigger pic inside…More Here! »

Jonathan Rhys-Meyers shows off his bare chest under a leather jacket as Valentine in this new still from his flick The Mortal Instruments: City of Bones, provided exclusively to JustJared.com.

Set in contemporary New York City, a seemingly ordinary teenager, Clary Fray (Lily Collins), discovers she is the descendant of a line of Shadowhunters, a secret cadre of young half-angel warriors locked in an ancient battle to protect our world from demons. After the disappearance of her mother (Lena Headey), Clary must join forces with a group of Shadowhunters, who introduce her to a dangerous alternate New York called Downworld, filled with demons, warlocks, vampires, werewolves and other deadly creatures.

Kevin Zegers, Robert Sheehan, Jemima West, and Godfrey Gao also star in the flick and are featured in new stills below.

Make sure to check back later today for a surprise exclusive look at the film, out in theaters August 23.

Check out the brand new trailer and poster for Lily Collins and Jamie Campbell Bower‘s upcoming movie The Mortal Instruments: City of Bones!

Here is the film’s synopsis: Set in contemporary New York City, a seemingly ordinary teenager, Clary Fray (Collins), discovers she is the descendant of a line of Shadowhunters, a secret cadre of young half-angel warriors locked in an ancient battle to protect our world from demons. After the disappearance of her mother (Lena Headey), Clary must join forces with a group of Shadowhunters, who introduce her to a dangerous alternate New York called Downworld, filled with demons, warlocks, vampires, werewolves and other deadly creatures.

The film, which will hit theaters on August 23, 2013, also stars Jonathan Rhys-Meyers, Kevin Zegers, Jemima West, Robert Sheehan, Jared Harris, and Kevin Durand.

WHAT DO YOU THINK of the trailer for The Mortal Instruments: City of Bones?

Jamie Campbell Bower shows off his tattooed arms on the set of his film The Mortal Instruments: City of Bones on Thursday (August 23) in Toronto, Canada.

The 23-year-old actor has the temporary tattoos for his role as Jace Wayland in the fantasy film.

PHOTOS: Check out the latest pics of Jamie Campbell Bower

Robert Sheehan and Jemima West, who play Simon Lewis and Isabelle Lightwood respectively, were spotted on set playing around on a Macbook laptop.

30+ pictures inside of Jamie Campbell Bower and Robert Sheehan on set… More Here! »

Lily Collins and Jamie Campbell Bower get into character on the set of their new film, The Mortal Instruments: City of Bones, on Monday (August 20) in Toronto, Canada.

The 23-year-old actress and her 23-year-old rumored real-life boyfriend were joined on set by their co-stars Kevin Zegers and Jemima West, who are playing the Lightwood siblings in the film.

The story follows Clary Fray (Collins), a seemingly ordinary teenage girl, who finds out the truths about her past and bloodline after her mom (Lena Headey) is attacked and taken from their home in New York City by a demon. Her entire life is changed on her quest to get her mom back.

25+ pictures inside from the set of The Mortal Instruments: City of Bones… More Here! »