MTV On the Set of 'The Mortal Instruments'

Set visits are cool enough, but set visits that involve a big party scene? Even better.

MTV's Josh Horowitz was on the Toronto set of the highly anticipated "The Mortal Instruments: City of Bones" and got to hang out by the punch bowl with Lily Collins (Clary Fray), Jamie Campbell Bower (Jace Wayland), Kevin Zegers (Alec Lightwood), Jemima West (Isabelle Lightwood) and Robert Sheehan (Simon Lewis). Everyone seems very excited to be bringing Cassandra Clare's bestselling novel to life ... even at three o'clock in the morning.

Check out the video of the set visit above, courtesy of "The Mortal Instruments: City of Bones" opens Aug. 23, 2013.