The pair dressed up as Mexican death and a skeleton for a party on Friday in Beverly Hills as they enjoyed a rare night out away from their six-month-old baby boy Luca.
Complete with a skull-painted face, fingerless gloves and flowers in her hair Duff, 25, had gone all out with her costume.
She also showed off her sexy curves in a figure hugging, cleaving baring corset which she teamed with a long red skirt.
Not wanting to let the side down Comrie, 32 - who also had his face painted - had zipped himself into an all-in-one bones outfit.
Duff recently got another tattoo, bringing her tally to six. She tweeted a photo of herself getting the inking on her forearm on Thursday.
The body art is of a sparrow with the words 'Stand By Me' written underneath it.