16V rear suspension

Hello Everyone,
Out driving my wife and baby, who were seating in the rear, I noticed that the rear of the car looked alittle low.

Sure enough after returning home the rear has yet to self-level. No items were or are in the truck as we speak. The rear wheelwell looks as if it is resting on the tires. What could possibly be the problem now. It did not look that way before we Left the house.

Any suggestions on what to check would be appreciated. Also what if any in cost is involved in(if any) repair.

Thanks very much in advance.