One of the cutest friendships over the past few seasons of Real Housewives of Beverly Hills has been that of Brandi Glanville and Lisa Vanderpump. But is the friendship now dunzo?

Radar Online reports that Brandi and Lisa recently got into an epic fight while filming the show's upcoming Season 4 in Puerto Rico, and that they are now no longer speaking to one another. Say it ain't so!

We had previously reported that Lisa had unfollowed Yolanda Foster on Twitter after a reported fight in Puerto Rico, and now it sounds like Brandi and Lisa are having issues because Brandi took Yolanda's side in that skirmish.

"It was absolutely wild!" a source reveals about the fight. "Yolanda directly went after Lisa and accused her of always stirring the pot among the other cast members, and accused her of being a crappy friend. Shockingly, Brandi had a go at Lisa as well!"

"Brandi revealed that Lisa had told her to take magazine articles about Kyle Richards' hubby Mauricio Umansky cheating on her on a trip the ladies took several weeks earlier to Palm Springs," the insider adds. "Brandi told Lisa, 'Don’t you dare try to lie about this one, there is no way you are going to weasel out of this one.' Needless to say, Lisa was absolutely floored and couldn’t believe Brandi had turned on her!"

Reportedly, we'll see Brandi and Lisa confront Kyle early in this season with rumors that Mauricio has been cheating on her. However, Kyle is said to not believe the two ladies and feels betrayed by their allegations. 

Wow! We can't imagine Brandi and Lisa not being besties on this show, so we suppose we'll just have to wait and see how it all plays out when the season airs. 
 
Source: Radar Online