Rihanna Victoria's Secret Fashion Show: Justin Bieber, Bruno Mars Perform as Lingerie Models Rock Runway, RiRi Gets Sexy Backstage [VIDEO]

Pop stars Rihanna, Justin Bieber, and Bruno Mars performed at the 2012 Victoria's Secret Fashion Show Wednesday evening (Nov. 7) as sexy, lingerie-clad models rocked the fierce runway for the annual, pre-holiday celebration. Rihanna performed her newest single "Diamonds" and closed out the catwalk with her hit "Fresh out the Runway" - Mars performed "Locked Out of Heaven" and "Young Girls" while Bieber performed "Beauty and the Beat" and "As Long as You Love Me" to a crowd of screaming, applauding fans. Read More »