The 'I Knew You Were Trouble' singer said in an interview that she'd seen one of her friends take back a cheat, and it's thought she was talking about teen tearaway Bieber and Selena.
Taylor told Glamour magazine: "I've seen my friends take someone back after they've cheated because they fit perfectly".
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Taylor first hinted at a rift with Justin, after she was filmed sticking her tongue out at him at the Billboard Music Awards.
Her friend Selena kissed her ex backstage and Swift was having none of it.
"You do not want to open that can of worms," Taylor reportedly said when asked what she and Selena were gossiping about at the time he picked up his award.
Singer Taylor Swift performs at Z100's Jingle Ball 2012 presented by Aeropostale at Madison Square Garden on Friday Dec. 7, 2012 in New York. (Photo by Evan Agostini/Invision/AP) (credit:AP)
Z100's Jingle Ball 2012 Presented By Aeropostale - Show(42 of42)
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NEW YORK, NY - DECEMBER 07: Taylor Swift performs during Z100's Jingle Ball 2012 presented by Aeropostale at Madison Square Garden on December 7, 2012 in New York City. (Photo by Kevin Kane/Getty Images for Jingle Ball 2012) (credit:Getty Images)