Right, I've just found a walkthrough for this game and the only mention of Bryce is that he's at the Center. I hope you know what it means by the Center. That's the only place he seems to be as far as I can see.
If it helps, he's apparently near Kirstee and Siernna (in the same area anyway).
I hope that helps everyone.
Jay
Edit: Passwords Found
I just found some in game passwords for some extra stuff if anyone wants them.
To enter them just go to the Bratz' Office Computer and type in any, or all, of the following passwords.
Password - Effect
JEWELZ - Gift set C (clothes)
FLAUNT - 2000 Blingz
SKATIN - A bonus outfit
TREATZ - 25 pet treats
SIZZLN - 1000 Blingz, 1 cell phone music track, 1 cell phone ringtone, 1 cell phone cover, 1 make-up decal, & some concept art
STYLIN - Unlocks Gift Set A