Using a Camera LookAt in Matinee, How do I allow the Camera to go Upside-Down?

I’ve got my camera following another object with a LookAt group, and I want it so as the object passes underneath the camera, the camera will swing around upside-down and continue to follow the object. The problem is that the camera defaults to keeping itself upright (which makes sense for most cases.) Is there a setting I can tweak somewhere to make it not do this? I can animate the camera by hand to go upside-down, but the movement is not as smooth.

Any help would be appreciated, Thanks!