My chin pokes out when I smile. What can be done to correct it? (Photos)

I have always had a strong chin, and it gets rather sharp and pointy when I smile. It seems to me that it's just the muscle of my chin and it's not the actual bone. What could I do to fix this? I would prefer a minimally invasive option, but would consider surgery. It doesn't seem like a common problem so I'm not sure where to start looking for options.