tAs of now (August 15, 2010) California Gurls is the most popular Katy Perry song in America!
katy perry's most popular song is thought to only be california gurls but, it could also be firework. you choose your favorite.
As of 2011, the most popular song in the US is probably Firework by Katy Perry.
Katy Perry's "I Kissed a Girl (And I Liked It)"
VERRY popular with the song ''FIREWORK'' my opinion is 50/100
It is one of her most popular songs, but she has many other best songs.
Most!
Katy Perry.
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Part of Me - Katy Perry song - was created in 2010.
Katy Perry
The song "firework" by Katy perry is a pop song
Waking Up in Vegas is Katy Perry's newest song.