Lopez participates in telethon in Los Angeles to raise money for Haiti. Plus: Kim Kardashian, Leo & Bar, Pete Wentz and more

Credit: Ringo/Pacific Coast News

Published: Tuesday Jan 19, 2010 | 05:00 PM EST


It's fandemonium! Teen sensation Justin Bieber is swarmed by starstruck fans Monday as he leaves an office building in London. In town since last week, the singer Tweeted he's been "having fun" while in the U.K.