JENNIFER ANISTON has called off her wedding to JUSTIN THEROUX – and it’s all ANGELINA JOLIE’s fault!

The 43-year-old actress is outraged that her bitter love rival has stolen her thunder once again, this time by announcing her own engage­ment to Jen’s ex-husband, Brad Pitt, say sources.

“This was going to be Jen’s BIG year for love and happiness,” said an insider.

“She and Justin were knee-deep in wedding preparations when Jen got the shattering news that Brad and Angie were announcing their en­gagement and making plans to wed this year.”

As The ENQUIRER reported, Jennifer collapsed in tears when Brad, 48, broke the news in an early April phone call. In turn, Justin, 40 – who has been dating the “Friends” beauty for a year – blew up at Jen for continuing to obsess over Brad.

“At that point, Justin said it would be best if they indefinitely postponed their wedding plans,” continued the insider. “He doesn’t want to be drawn any deeper into the twisted soap op­era of Jen, Brad and Angie.”

Meanwhile, Jen feels that Angelina, 36, intentionally blindsided her, said the insider.

“She wholeheartedly believes that Angie engineered the timing of the engage­ment announcement to Brad to get in another dig.

“Jen is more furious than heartbroken. She feels like she’s been stabbed in the back all over again, after enduring the pain of having Angie steal her husband seven years ago.

”Jen and Jus­tin’s marriage would have been THE wedding of the year, but Angie went and hijacked Jen’s spe­cial moment.

"NOW, Jen wants revenge!”

ALL the details are in the new ENQUIRER – on sale now!