Justin Bieber effect: Taylor Swift angry with Selena Gomez

Singer Taylor Swift is reportedly not too thrilled that close buddy Selena Gomez is said to be back in the arms of her boyfriend Justin Bieber.

Us Weekly has reported that Swift is "disgusted" that the pair is back together, and has promptly given Gomez the short shrift.

They were once so close that Taylor Swift dubbed Selena Gomez 'the closest thing I have to a sister'.

But Taylor has reportedly ditched her best friend following her decision to reunite with bad boy ex Justin Bieber.

Swift disapproves of her "Come And Get It" pal's decision to get back together with the troubled Baby hitmaker, following his recent legal troubles and hard-partying reputation.

Meanwhile, Bieber and his Disney princess have been getting all up close and personal again.

He sent his ex US$10,000 ($11,000) in flowers and flew from Miami to Texas to see her. She also accompanied him to the SxSW festival in Austin where he sang his hit tune As Long as You Love Me to her.

But apparently the rekindling of the romance isn't the only thing annoying Swift; she reckons that Gomez "used" a brief romance with musical pal Ed Sheeran to make Bieber jealous.

"After Selena pulled that move, Taylor started distancing herself," a source told Us Weekly.

And, the magazine revealed, the news that Selena and Bieber had spent the past weekend together was the final straw for Taylor - who is 'disgusted' by her former pal's decision.

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