Entertainment Katy Perry's Grammy Performance February 13, 2011 / 10:26 AM PST / CBS News (credit:MARK RALSTON/AFP/Getty Images) Grammy Awards Performances: Katy Perry (credit: Larry Busacca/Getty Images For The Recording Academy) Grammy Awards Performances: Katy Perry (credit:Larry Busacca/Getty Images For The Recording Academy) Grammy Awards Performances: Katy Perry (credit: Kevin Winter/Getty Images) Grammy Awards Performances: Katy Perry (credit: MARK RALSTON/AFP/Getty Images) Grammy Awards Performances: Katy Perry (credit:MARK RALSTON/AFP/Getty Images) Grammy Awards Performances: Katy Perry (credit: MARK RALSTON/AFP/Getty Images) Grammy Awards Performances: Katy Perry The pop smash "California Gurlz" won songwriting credits for its composers. (credit: Kevin Winter/Getty Images) Grammy Awards Performances: Katy Perry (credit: Kevin Winter/Getty Images) Grammy Awards Performances: Katy Perry (credit: Kevin Winter/Getty Images) Grammy Awards Performances: Katy Perry (credit: Kevin Winter/Getty Images) Grammy Awards Performances: Katy Perry (credit: Kevin Winter/Getty Images) Grammy Awards Performances: Katy Perry (credit: MARK RALSTON/AFP/Getty Images)
