Taylor Swift and Selena Gomez could be feuding over Justin Bieber. According to US Weekly, the "22" singer and "Stars Dance" performer, who are best friends, are fighting because of the baby-faced crooner.

Gomez' on- and off-again relationship with Bieber, 19, is causing a rift between her, 21, and Swift, 23. In fact, Swift can't stand Bieber reportedly.

"Taylor hates him," a source told US. "She thinks Selena makes a mistake every time she reconciles with him. Bieber has really become between the girls."

The hate that the country singer feels for the Biebs is so strong that she declined to comment when she was asked about him at the Billboard Awards in May. For our story on Swift shunning Bieber at the awards, click HERE.

The blonde songbird, who has been romantically linked to Ed Sheeran and Matthew Gray Gubler, had even stuck her tongue out at Bieber at the star-studded affair.

Gomez and Bieber were seen kissing backstage, which did not make Swift happy. And apparently, Bieber is not happy with Gomez' BFF.

"He complains Taylor's always telling Selena she can do better," a Bieber insider told US.

With a mutual dislike for each other, the Grammy winning "Everything Has Changed" singer and Bieber are definitely at odds. But, Swift still loves Gomez.

When the Adidas NEO designer turned 21 recently, Swift tweeted that she was the closest thing that she has ever had to a sister.

Think Gomez and Swift can patch up their friendship? Think Bieber will not get in the way? Tell us in the comments section below!