Emma, who played Hannah Ashworth in the C4 soap, appears in the video for The Union's debut single 'Tonight I'm Alive'.
The actress, 23, is first shown with her naturally blonde locks while sat in front of a mirror. But after dancing around a bit and grabbing a hairbrush, Emma dons a brunette wig.
Emma teams her new dark hair with a ring of black flowers before heading to a gig. She later turns into a vampire and gives the band members the kiss of death.
Since leaving Hollyoaks in 2010, Emma has starred in BBC drama Prisoners' Wives.
She has also appeared in Pramface and has more recently bagged a part in new American fantasy Once Upon A Time In Wonderland, which will air in the US in October.
Watch The Union's music video here: