Friends Now Foes: Old Co-Stars Courteney Cox & Lisa Kudrow Plan Show — Without Jen!

Who needs friends like these?

Jennifer Aniston has been stabbed in the back by her former Friends co-stars Courteney Cox and Lisa Kudrow, dished insiders who said they are planning a hot new TV project without her!

"Courteney and Lisa are discussing doing a series together," revealed a source exclusively to RadarOnline.com.

"They always got along and want to work together again. But Jen's always busy with a million projects, so Courteney didn't even bother asking her to join them."

But being left out will hit Aniston like a wrecking ball, according to sources.

"This will leave Jen stinging," spilled the insider.

"Lisa and Courteney are doing this just as Jen's Apple series with Reese Witherspoon gets underway. Jen may see this as a competitive move."

With Aniston, 49, nowhere in sight, Cox, 54, and Kudrow, 55, recently met up at The Palm restaurant in Beverly Hills — but this was not just two women catching up over lunch, added the insider.