I have a question regarding limousine rentals?

i rented a limo that holds 10 passengers.. but i have 11 people.. a few people are very skinny and i know that the couples who are going will take up less space.. the girls will be sitting on their guys lap basically..will the limo company allow that? and also some of the people in the limo are 21.. the rest are 19/20 .. will they complain about bringing liquor in the limo?