By Alexis Tereszcuk - Breaking Celebrity News Entertainment Editor

Wowsa! There's no doubt whose side Eddie Cibrian is firmly on!

After a brief period of relative peace, the actor's ex and current wife are embroiled in a bitter war of words once again, with name calling and accusations flying thick and fast — but Cibrian is not afraid to step straight into the war zone, and make it clear who he is backing. A source close to the situation exclusively shared with Breaking Celebrity News a scathing email that Cibrian fired off to Brandi Glanville.

Read Eddie Cibrian's Scathing Email To Brandi Glanville

As previously reported, Glanville threw fuel on the fire in her on-going fight with LeAnn Rimes this week when she told Us Weekly that the singer is a "mentally unstable presence" she doesn't want around her young sons, Mason and Jake.

The Real Housewives of Beverly Hills star also claimed that the only way she can get any kind of response from Cibrian is to post a rant on Twitter, but Breaking Celebrity News has exclusively obtained email evidence to the contrary.

"I emailed, emailed, called, called -- no answers," Brandi claimed to Us Weekly in an exclusive interview. "I don't have communication with Cibrian and Rimes because I don't get responses when I reach out. I only get responses when I put it on Twitter."

Brandi, who has been fighting with LeAnn on Twitter over her sons, went on to tell Us Weekly that she recently received an email from Cibrian that only a