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Congrats to Katy Perry!!! She has now tied Rihanna for most #1's on
the Billboard Pop Charts in history! They each now have 10 number one hits!

(The chart has only been around since 1992 so in reality Michael Jackson would have the most number ones :-)

Here's the list and who is right behind Katy and Rihanna...

 

Most #1's in History:

 

10, Katy Perry
10, Rihanna
9, P!nk
7, Lady Gaga
7, Britney Spears
6, Beyonce
6, Mariah Carey
6, Maroon 5
6, Bruno Mars
6, Justin Timberlake