WEll, I'm afraid that's something we discuss quite often on here and that is a Flash induced orb. When you use flash photography, it is very susceptible to dust or any kind of particles in the air. The light from the flash comes direct on and ends up creating an out of focus light source which looks like an orb.
But I do see something strange through the middle of if. Could just be part of the shirt or hair though. Difficult to tell.