Photos of the Week: Katy Perry, Nick Jonas, Lil Mama
Katy Perry helped fans in Austria get into the holiday spirit, while Lil Mama helped feed the less fortunate in New York. Nick Jonas went solo at the Grammy nominations concert, Ashlee Simpson made her Broadway debut and Stevie Wonder got props from the U.N. It all happened this week, and we've got the pics to prove it.
News of the Week: Billboard's 5 Most Popular Stories
1. Vote: The Year and Decade In Music Readers' Poll