Unsurprisingly, Brandi Glanville and Lisa Vanderpump butted heads on this week's Real Housewives of Beverly Hills Season 4 Reunion Part 1. Brandi claimed that Lisa is a different when the cameras aren't rolling, pointing out that she and Lisa would have off-camera drinks at SUR until the wee hours of the morning. Now, Lisa is taking to Twitter to debunk this assertion.

On March 18, Lisa tweets that  if she ever did drink until late at night at SUR  the restaurant would lose its liquor license, given that she's such a lightweight when it comes to booze. 

"Umm, no  I don't drink in Sur till 4 a.m. I would lose my license," Lisa writes. "If I have two drinks I am good.. three I am useless. Another attempt.."

So Lisa apparently thinks Brandi is making up stories to discredit her. But we have to wonder what Brandi is referring to, since she definitely seemed convinced that she and Lisa had shared late-night drinks at Lisa's restaurant. Perhaps this is yet another story that we'll never know whether to believe or not.

Do you think Brandi and Lisa have ever had drinks until 4 a.m. at SUR?

Source: Lisa on Twitter