Using or letting your car be used in a wedding?

How many of you guys have used your cars in weddings or any other antique cars you have ? I have my sisters in-laws wedding tomorrow so I am dropping off the car they want to use tonight. I used this car with two others in my own wedding a year and half ago. But I am very nervous about the whole thing meaning my sister in-law can be a bridzilla and if something happens god only knows the reaction. The car is 59 years old. Maybe I am just overly paranoid.

taken this morning at work ( She is a 20 footer) Good from a far, but far from good