It's been confirmed, the wonderful Sigourney Weaver is on board to star in Harald Zwart's sequel to The Mortal Instruments. This one's called The Mortal Instruments: City of Ashes.

While there had been rumours recentlyof Miss Weaver's involvement, Zwart confirmed mid interview with yesterday that it is indeed a goer. "Yes Sigourney is on board, now you can break the story!".

Weaver will star as the leader of the Shadowhunters. Here's hoping she'll add some much needed panache to the franchise.

Robert Sheehan, Lily Collins and Jamie Campbell Bower are all confirmed to return.

Our exclusive interview with Harald Zwart and chat with Sheehan, Collins and Campbell Bower will be live on site tomorrow. Check back in the am!