Dunn, Kemp for Derry crime film
The pair have signed up for The Best Years, currently being filmed in Derry, Northern Ireland.
Dunn plays Nadine McKnight who is married to Kemp's character Simon. The film sees three Irish small-time criminals compete with an English gang to pull off a huge burglary.
"Sarah’s very excited about her role," said a source. "It’s about as far away from Hollyoaks as you can get and she is keen to show there’s more to her than blonde bimbos.
"She feels it’s really stretching her as an actress and she is loving every minute."
However, the Daily Star also reports rumours she could return to the soap. One source said: "Sarah returned for a few episodes recently for her friend Becca’s funeral. She made such an impact, it would be great to have her back again."