Britney Spears looked like she was in great spirits during a shopping trip in Topanga, CA yesterday. She pulled her usual move — changing outfits into her freshly purchased clothes halfway through. Britney's rumored to have new music coming out very soon as fans get excited for the episode of Glee featuring her songs. This week, Ryan Murphy revealed new details about it including that showcasing her famous tracks was all Miss Spears's idea. He said, "I just think that she loves what the show is about, that the show’s about paying tribute to pop culture in a very loving, respectful, kind way. She responded to that."