Real Housewives of New York City's Ubah Hassan Makes Appearance at Gala Alongside Former Mystery Man Oliver Dachsel

Ubah Hassan and Oliver Dachsel attend the American Ballet Theatre Fall Gala Dimitrios Kambouris/Getty Images

Real Housewives of New York City star Ubah Hassan's mystery man has finally been revealed. Ubah, who is 40 years old, was seen happily posing with her boyfriend Oliver Dachsel, an investment banker, at the American Ballet Theatre Fall Gala at NYC's Lincoln Center on Tuesday, October 24. For the event, the model looked stunning in a silvery, sequined one-shoulder gown, complemented by matching jewelry and pointed-toe heels.

Oliver, on the other hand, earned the nickname "Mr. Connecticut" on RHONY and appeared dapper in a black tuxedo and bow tie.

During season 14 of RHONY and part 1 of the reunion that aired on Sunday, October 22, Ubah remained secretive about their romantic relationship. (Part 2 will be broadcasted on Bravo Sunday, October 29, at 9 p.m. ET.)

During episode 13, which aired earlier this month, Ubah showcased her partner to her co-star Sai De Silva. Ubah's partner holds the position of managing director at an investment firm. This occurred in response to Sai's husband, David Craig, expressing curiosity about why Ubah was still single.

Ubah Hassan revealed in a confessional during the episode that the only person who is aware of her situation is Sai. She further emphasized that if she were to disclose this information to Erin, who works for The New York Times, it would become public knowledge among a wide audience.

Despite swearing to keep the information a secret, Sai, aged 42, later divulged the details to Erin, 36, who then shared them with their co-star Brynn Whitfield. The gossip reached its peak at Brynn's birthday party during the season 14 finale when Brynn, aged 36, exposed to the entire group that Ubah had a boyfriend who resided in Connecticut, a fact that had been kept under wraps. Enraged by Brynn's lack of discretion, Sai abruptly left the event, expressing her anger with strong language. "That is her business, that is her story to tell. You don't f--king do that. F--k you, Brynn. ... Have a good birthday. F--k you," Sai declared before making her dramatic exit.

After the dramatic unfolding of events at the party, Ubah left early, with Sai following closely behind, desperately apologizing for revealing her secret.

During her recent appearance on Watch What Happens Live With Andy Cohen, Ubah opened up about her reasons for wanting to keep the relationship private.

"I kept it a secret because I'm exhausted. Whenever I meet someone, I want everyone to notice. But if it ends up not working out, I have to go back and admit that it failed. I'm tired of constantly saying, 'Oh, it doesn't work anymore.'"

Despite her hesitations about revealing her love story to the public, Ubah mentioned to host Andy Cohen that she and Oliver had been in a relationship for a significant period. Cohen, aged 55, expressed his support for Ubah's partner, describing him as "handsome and robust."