Hayden Panettiere, her "Heroes" co-stars and many more came out to the Calabasas Lamborghini dealership to support a great cause last night: The fight against epilepsy.

The stars were hyped for their hot-rod arrivals, but Hayden revealed to us driving up in the Lambo wasn't as easy as it seems.

"We got to open it up a little bit on some of the highways, but it's hard with those cops!" she admitted.