December 04, 2009 1:45 EST
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.
SEE THE PHOTOS OF THE WEEK | LAST WEEK'S PHOTOS
News of the Week: Billboard's 5 Most Popular Stories
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3. Beyonce, Taylor Swift, Peas Lead Grammy Award Nominations
4. 'Empire' Entrenched At No. 1 On Billboard Hot 100
5. Bruce Springsteen: The Billboard Cover Q&A
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