(Cover) - EN Showbiz - Brandi Glanville's "huge ego" is reportedly infuriating her Real Housewives of Beverly Hills castmates.

The reality star, who is the ex-wife of Eddie Cibrian, and her new best friend Lisa Vanderpump are both causing a stir on set with their diva antics.

RadarOnline reports that Brandi and Lisa are running amok.

"[Brandi and Lisa] are absolutely joined at the hip this year," a source told the site.

"It's absolutely bizarre because Lisa told the other ladies to not talk to Brandi at all when she first joined the show last year. Lisa was livid because Brandi was friends with [family friend] Cedric, and she thought she could just freeze out Brandi, and that if she did so, the other ladies would follow. Towards the end of the second season, Brandi and Lisa did begin to get along. However, during the current season, Lisa, who always likes to act like the mother hen of the show, has taken Brandi under her wing, and the two are now inseparable. The two have such huge ego's, and their antics are driving the other ladies, especially Kyle [Richards] and Taylor [Armstrong], absolutely nuts."

Brandi recently said that she feared she would "physically hurt" Eddie's new wife LeAnn Rimes after seeing her with her two children. (C) Cover Media