it's photoshopped. the original is floating around somewhere. the olsen twins diet of cocaine and self-hatred means there's no way they have titties like that.
full house was one of the shows i watched religiously as a kid, though i have no idea why. the combination of bob saget's sweaters and the hotness of the woman who played stamos' wife somehow did it for me.
what's hilarious is how none of the actors from full house have done anything other than become substance abusers, c-grade actors or nobodies except for the olsen twins, who are now billionaires. insanity.