The Vanderpump Rules cast is in Las Vegas for Katie Maloney's birthday celebrations.

Katie Maloney Confronts Stassi Schroeder On 'Vanderpump Rules'

Although it is unclear whether they are filming for their hit Bravo series, several cast members, including Scheana Shay, Tom Schwartz and Jax Taylor, are in town to party with Maloney.

"Happy Birthday to one of the coolest most bad a-- girls I know! Can't wait to celebrate w u in VEGAS!! @MusicKillsKate I love you!" Shay wrote on Twitter on Friday. A short time later, Taylor confirmed he was in Vegas, as well. "Amazing dinner last night with favorite vegas people @Scott_Archibald @maddyarchibald @LArchii13 thanks for having me."

'Vanderpump Rules' Star Katie Maloney Enjoys Miami Sans Stassi Schroeder

During the third season of Vanderpump Rules, Shay and Maloney, who were previously on the outs, put their differences aside, and traveled to Miami, where they celebrated Shay's bachelor/bacherorette weekend. Since then, the pair have continued their friendship.

Meanwhile, Maloney's friendship with Stassi Schroeder remains strained. After sitting down with Schroeder on the show, the former friends' relationship appeared to be on the rocks, and at this point, it's hard to tell if they are friends at all.

Maloney's boyfriend, Schwartz, sent her a special message on Instagram.

"Happy birthday to the one I love, the one and only @musickillskate aka bubba," he wrote.

For more of Katie Maloney and the cast, tune into Vanderpump Rules every Monday night at 9 p.m. on Bravo.

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Vanderpump rules, Tom Schwartz, Katie Maloney, Scheana marie, Jax Taylor, Bravo, Reality TV