Justin Bieber navigates the globe in his video for “All Around the World” featuring rapper Ludacris. 

Sure, music festivals are fun, but they're also expensive, crowded and, in the case of this weekend's Coachella Festival in Indio, California, ridiculously hot.  

A while back, Taylor Swift announced a partnership with Diet Coke -- her favorite beverage -- and now the singer has debuted her first commercial for the company. 

 

Last year, South Korean rapper PSY's "Gangnam Style" video became the first-ever clip on YouTube to rack up one billion views.  Can his new single match that?