Your attitude and your verbal answer both contribute to the answer in this case. It might just be a momentary weight gain. Most importantly, I would answer that beauty is not only outward but inward. A person's inner beauty really does shine through and can make an average looking person beautiful. As to the second part of the question asking what I would do about it, this would also be up to you to answer.
Some people are passive and others are agressive.
I am definitely the latter. I would confront the situation with the director and discuss my weight gain. If it was a decision as to whether to lose weight or give up my crown, I would give up my crown. This might be because they believe once you make a commitment, it is important to keep it. Once again, the answer is up to you.