Is "The Real Housewives of New York City" about to get a new cast member when the show returns next year? Last season's rookie, Jules Wainstein, has reportedly said that she won't be coming back to the show as she is going through a divorce and is putting her family first. Now, new reports claim that socialite Tinsley Mortimer will be joining the series as the newest Housewife.

Sources told Page Six that Mortimer was seen filming the show with Ramona Singer and Sonja Morgan on Wednesday, Nov. 16 at NYC hotspot Beautique. The insider added that the trio filmed until 2 a.m. and that Mortimer was allegedly "flirting with all the boys" at the party.

"But she was well-behaved," the source said. "Ramona and Tinsley had many glasses of champagne, but they decided to sober up by ordering a couple of appetizers to the lounge. They ladies left at 2 a.m."

The insider said that rapper Busta Rhymes was also at Beautique's bar, and when producers tried to convince him to appear on the camera, the "Dangerous" hitmaker reportedly declined.

Mortimer was also seen at a surprise birthday party for Singer last week and all the Housewives were present, except Bethenny Frankel. It is unclear if the Skinnygirl mogul will be returning to the reality series, as she revealed in an earlier interview that she will be distancing herself from "RHONY" after filming season 8.

Mortimer is the ex-wife of Topper Mortimer. The socialite made headlines earlier this year when she was arrested for allegedly trespassing at an ex-boyfriend's Palm Beach home. She starred in the 2010 reality series "High Society," and another Page Six insider said that the Bravo show has been trying to get her to join the series "forever."

"I guess they finally did it," said the source.

Apart from Singer and Morgan, it is expected that Luann de Lesseps will be back for season 9, along with Carole Radziwill and Dorinda Medley.

"The Real Housewives of New York City" season 9 is slated to premiere in 2017 on Bravo.