Adrienne Maloof tweeted about a charity event earlier this week, and was quickly called out by her former friend and Real Housewives of Beverly Hills co-star, Lisa Vanderpump.

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On Monday, the former reality star took to Twitter, where she shared a photo of herself at the Hero Dog Awards, and tagged Vanderpump in her photo as if the two women were both in attendance.

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Moments later, however, Vanderpump tweeted back to Maloof, setting the record straight, and revealing she wasn't actually at the event.

In response to the women's online exchange, a number of Twitter users shared tweets of their own regarding the ladies' drama. On fan even slammed Vanderpump for calling out her former friend, explaining the focus should remain on the charity, not on who was or wasn't in attendance.

"Why would you feel the need to tweet this? It's for charity," the woman wrote, citing Vanderpump as "classless and drama hungry."

While Vanderpump didn't attend the event, she did host the Hero Dog Awards luncheon weeks ago at her West Hollywood, Calif. restaurant, PUMP Lounge.

Tags: lisa vanderpump Adrienne Maloof Bravo Reality TV The Real Housewives of Beverly Hills