I do a lot of public speaking and presentations and I'll always start with a self-deprecating joke to make everybody feel comfortable with my size because there can be hang-ups and anxieties.
The challenge is to keep it fresh. If you're talking about Britney Spears over and over, it's very hard to keep that interesting.
Knowing that I'm not a model and I'm never going to be has relieved me of the pressure of looking good. If you don't establish yourself as McDreamy then you don't have to live up to it.