British actress Kelly Brook almost drowned while filming scenes for her latest movie Fishtales, after hitting her head on a rock.

The Smallville star plays Neried in the film, a feisty mermaid who falls in love with an Oxford-professor, played by her real-life fiance Billy Zane.

But while shooting one scene off the Greek island of Spetses, Brook sustained a minor head injury and struggled for air as her legs were strapped into her mermaid costume.

She says, “I held my breath as ...