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If you've been watching any of Real Housewives of Beverly Hills Season 4, you should have a hunch that the upcoming reunion will contain some serious tension. And this is turning out to definitely be the case.

The show's cast filmed the Season 4 reunion on February 7, and E! Online is reporting that there was some major drama. "It was a long, emotional day," says the insider. "Everyone left pretty drained." Indeed, host Andy Cohen had previously tweeted about how tough the reunion taping was.

Specifically, Lisa Vanderpump and Brandi Glanville had words. "Lisa and Brandi definitely went back and forth," says a source. "Brandi's main issue with Lisa was her relationship with Scheana [Marie]. Brandi sees it as a huge betrayal. It's a constant reminder of the pain Eddie Cibrian put her through."

However, it seems that there might be some optimism in how those two ladies ended things at the taping. "But while they were definitely emotional and angry, there is hope for them," the source reports. "It's not a closed door. They left things open-ended." Good to hear!

Also going at it during the reunion were Kyle Richards and Carlton Gebbia. "They did not have one nice word to say about each other [at the reunion]," says the source. "They came in disliking each other and left the same way."

And it seems that Joyce Giraud had issues with a lot of the ladies at the reunion. "Everyone was getting annoyed with her," adds the source. "She's not very popular among the other women at all." Not even with Kyle? Hmm.

Are you surprised by what went down at the reunion?

Source: E! Online