The Modern Family actress is set to star alongside her boyfriend Dominic Sherwood on the Netflix series.
The star announced via Instagram that she will be playing the role of the Seelie Queen.
"Sorry I tricked you all in to thinking I wasn't the Seelie Queen. In my defense I never lied... I was just getting in to character ;) 👑 #shadowhunters," she captioned the pic.
We think she looks incredible!
This article originally appeared on Girlfriend.