'California Gurls', Teenage Dream', 'Firework', 'E.T.' and 'Last Friday Night' are the singles that bagged Katy her spot in chart history.
And Katy looks set to get five No. 1s on the US Hot 100 chart too if 'Last Friday Night' makes the top, which will match Michael Jackson's record of five No. 1 singles from his 'Bad' album in 1988.
Katy's ‘Last Friday Night’ has become the most played single on US pop radio this week with 12,468 plays.
Not bad for an artist who only released her debut single 3 years ago.
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