Efron covers his signature shag do with a knit hat while out in Burbank, Calif. Plus: Kristen Stewart, Johnny Depp, Gisele Bündchen and more

GOING MOBILE

We've got his number! Tracy Morgan goes undercover as a cell-phone promoter Tuesday on the set of his new flick A Couple of Dicks in Brooklyn, N.Y. The Kevin Smith-directed comedy also stars Bruce Willis, Seann William Scott and Adam Brody.