Do you mean Jamie Dornan?
(Because I tried looking up a Jamie Dorian and didn't really get anything).
Well, for Jacey it's gonna be difficult, you could just google "blonde actress under 30" or the like and pic out one that's closest to what you imagine her. If I was simply by going with hair colour and maybe not so often used I'd have proposed someone like Candice Swanepoel, but I guess she's too pretty for what you imagine?