Katy Perry ET Music Video Leaked on YouTube
The not-yet-released film clip of the song was later removed.
Will it help Katy knock lady Gaga from the top spot on the charts?
Pop superstar Lady Gaga has managed to stay in the number one spot on Billboard's hot 100 singles chart for the sixth week in a row.
Gaga, real name Stefani Germanotta, has fought off competition from Katy Perry to spend a sixth week on top with Born This Way.
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