MILEY CYRUS’ wild antics have turned her onetime best friend Taylor Swift into a bitter enemy!

Country singer Taylor is so afraid that Miley’s bad behavior will tarnish her own carefully crafted good-girl image she’s started slamming the former Disney princess.

“Taylor refuses to hang out with Miley anymore,” revealed a close source. “She’s telling friends there’s no place in her life for Miley and her crazy antics.”

Taylor has even stopped returning phone calls from Billy Ray Cyrus’ raunchy daughter, who performed with a topless dancer in a Christmas show.

“She’s so worried that Miley is a a loose cannon that she decided to make a clean break,” added the source. “She did it without any explanation to avoid any kind of scandalous confrontation.”

But former Disney princess Miley is returning fire – blasting the 23-year-old country cutie to pals every chance she gets.

“Miley is furious!” said the source. “She’s trashing Taylor as a back-stabbing fake.”

And the former “Hannah Montana” star was quick to take advantage of a reporter’s tweet that praised her for being with the same guy for more than three years while sarcastically noting that Taylor has burned through more than a dozen boyfriends.

Miley, 20, let loose with a thinly veiled dig at Taylor, blasting the “idiots” who call her a “slut” because she is engaged and “madly in love with ONE man.”

As The ENQUIRER recently reported, after ill-fated romances with Joe Jonas, Taylor Lautner, Jake Gyllenhaal and John Mayer, boy-crazy Taylor moved on from a summer love affair with Conor Kennedy to teen heartthrob Harry Styles, a singer with the British boy band One Direction.

Still, all is far from perfect in Miley’s romance with fiancé Liam Hemsworth. As The ENQUIRER reported, she upset Liam by admitting she has a crush on an X-rated actress who appeared in her “Decisions” music video. She also cavorted with strippers during a raucous night out.

Selena Gomez, a pal of both singers, has tried to patch up the feud. But, so far, no luck.

Said the source: “It’s going to take a miracle to save Miley and Taylor’s friendship.”

OR a press agent.