'RHOBH' Stars Refuse To Film With Lisa Vanderpump, Claim She's 'Leaking' To Radar

Lisa Vanderpump's The Real Housewives of Beverly Hills co-stars are refusing to film with her after bitter accusations she's "leaking" to RadarOnline.com.

The source of the tension is a pup named Lucy, RadarOnline.com has exclusively learned.

Lisa’s once close pal, co-star Dorit Kemsley, adopted Lucy from Vanderpump Dog Rescue, the rehabilitation of dogs charity that Lisa runs.

As RadarOnline.com previously reported, Dorit, 42, "abandoned" the dog in a move that left Lisa, 58, feeling "stabbed in the back."

Now, the cast is privately accusing the larger-than-life British restaurateur of being the mole for oodles of negative stories to the gossip website, RadarOnline.com can reveal.

One cast member quipped to RadarOnline.com, "Lisa leaks like a sieve!"

But RadarOnline.com boss Dylan Howard said, "I can say unequivocally that Lisa has never been an anonymous source to the site — although I for one wish that she was! She’d be as rich with information as she is rich is real-life!"

The search for the leak is bound to be a plot line on the forthcoming season, a Bravo production insider told RadarOnline.com.

Vanderpump also won’t attend RHOBH star Camille Grammer’s wedding this weekend to attorney David C. Meyer in Hawaii in the wake of the scandal, RadarOnline.com has learned.

"The bad blood between all the costars is off the charts," said a source. "Everyone is ganging up against each other and real friendships are falling apart all in the name of fame and fortune. It’s very sad."