Fan goes home with Justin Bieber's hat

At 12, Petaluma's Olivia DeGraca already stands five-foot-nine. Every inch came in handy when the basketball/volleyball player, her mom and two pals saw Justin Bieber (either you know all about him or, like me, you had to Google him) last weekend at a sold-out concert at Oakland's Oracle Arena.

Standing in an aisle amid a sea of swooning girls, Olivia's height improved her view of the Canadian