Should I sing at my wedding?

I had been planning to sing one song during the reception at my wedding. It's a tradition that my father (guitar player) sits in with the band at weddings in our family so he's also doing that. The band I hired has been not so responsive recently (busy wedding season) and now I'm nervous about it all coming together. The thought of doing it makes me nervous and possibly that it will be seen as too self-indulgent, but the thought of not doing it makes me sad that I'm letting go of some of the personal touches of our day. Thoughts?