Why Doesn't Larry Want Us Taking His Picture?

Normally, whenever we see Larry Birkhead out and about, he's always more than happy to smile and pose for the cameras - so why was he so shy when we ran into him and a young male friend doing a little shopping at the Burbank mall over the weekend?

Could it be that Larry has a deal with another photo agency, who apparently gives Larry a cut of the profits of whatever pix they get of him?

We're just sayin'!