Sigourney Weaver Confirmed to Join 'The Mortal Instruments: CITY OF ASHES'

A month back, The Hollywood Reporter told us Sigourney Weavers was in negotiations to join The Mortal Instruments: City of Ashes. This casting news has now been confirmed by MovieNews:

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 entertainment.ie yesterday that it is indeed a goer. "Yes Sigourney is on board, now you can break the story!".

The Mortal Instruments: City of Ashes will start filming in Toronto this September 23.