Katy Perry rocks a patriotic outfit during the children's concert at the Washington Convention Center, where Usher also performed. Plus, John Legend and Rapper Common perform at the Inaugural Youth Ball; Norman Reedus promotes "The Walking Dead" in Taipei; Joseph Gordon-Levitt, Tony Danza, Matthew McConaughey, a very pregnant Kristen Bell and other film stars cut loose at the Sundance Film Festival; Dustin Hoffman and Gwyneth Jones share a close moment at the premiere of "Quartet"; and Le'Andria Johnson among the winners at the 28th Annual Stellar Awards at Grand Ole Opry House.