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Justin Bieber is reportedly the cause of a new rift between pop star besties Taylor Swift and Selena Gomez

"Us Weekly" is reporting that Taylor doesn't support Selena's friendship with her ex, and that Justin "has really come between the girls." 

Apparently Justin isn't very fond of Taylor either.  A source tells the magazine that the 19-year-old pop star doesn't like the fact that Taylor is "always telling Selena she can do better." 

But Selena herself has publicly denied reconciling with Justin on several occasions.  And things also seem to be going fine with Taylor as well.  On Selena's 21st birthday last month, Taylor tweeted her wishes and called her "the closest thing I've ever had to a sister."  

For the time being, both young ladies are busy on their respective tours.  

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