In a day of seemingly never stopping casting announcements, author Cassandra Clare revealed that Lena Headey would be tackling the role of Jocelyn Fray in The Mortal Instruments.

On her Tumblr page Clare stated

Jocelyn is a really fun character to write. She’s overprotective (but for a reason) and often really unyielding and unsympathetic, but she’s also a heroine who saved the world from Valentine, endured a lot of loss, and can execute some pretty badass moves. Moral ambiguity is always fun to play and who does it better thanthe gorgeous and talented Lena Headey. You probably know her best as Cersei from Game of Thrones.

I have had an actress crush on Lena for years so when they told me she was cast I did a happy dance and hit Sarah Rees Brennan on the head with a spoon. Actually I would have done that last bit anyway. Lena is amazing and I think she will be amazing as Jocelyn. I am super psyched.

What kind of chemistry do you think Lena Headey will have with co-star Lily Collins?