2. "California Gurls" (feat. Snoop Dogg)
Released: May 7, 2010
Chart Peak: Number One (Six weeks)
This was written as a frothy Pacific counterpoint to "Empire State of Mind," and you can hear the video's pastel artificiality in its production. What an ideal visual and aural setting for a charismatic Cali space cadet –we mean Snoop Dogg, whose appreciative leer is way more David Lee Roth than Brian Wilson. If the title reminds you Big Star's "September Gurls," Perry's manager Bradford Cobb suggested the spelling as a tribute to Alex Chilton, who had passed earlier that year.