We hear that tonight’s (June 18) episode of The Real Housewives of New York (Season 5, Episode 3: "Boozy Brunch") will feature Aviva Drescher’s ex-husband Harry Dubin, the much-talked-about party guy who everyone seems to know — intimately. So who is this mystery man? Here are five things to know.

He has slept with LuAnn and Sonja. To be fair, this is according to Heather Thomson, who spilled those particular beans on a double date with her and Aviva’s husbands in the last episode (Season 5, Episode 2: “Say What You Mean, Just Don’t Say It Mean”). But Sonja Morgan claims she and Harry have been friends forever, and LuAnn de Lesseps has yet to issue a denial.

He’s bank. Harry is a real estate investor in New York, and CelebrityNetWorth.com estimates he is currently worth $15 million.

Ladies love him. One quick glance at Harry’s appearances on Patrick McMullan’s socialite-heavy photo site leads us to believe that he is quite the ladies’ man. He loves posing with pretty young things, and we can’t honestly spot one (out of the many) girls that appears on his arm more than once. We do know that he currently has a girlfriend, Georgia.

We’ve seen him before. In the RHONY Season 5 premiere (Season 5, Episode 1: “A New New York”), we were treated to a brief glimpse of Harry from one of Sonja’s old parties during Season 4. He was one of Sonja’s friends who pointed out that she forgot to wear underpants during her royalty-themed costume bash. So he’s sort of a ghost from Housewives past.

He’s the father of Aviva’s son. As Aviva mentioned in the premiere, she and Harry have one child together: Harrison, their 10-year-old son.

Keep all these things in mind while watching Harry in action!

The Real Housewives of New York airs Mondays at 9 p.m. ET/PT on Bravo.  

Sources: CelebrityNetWorth.com, Patrick McMullan

Molly Friedman is an editor at Wetpaint Entertainment. Follow her on Twitter @MollyFriedman.

Get all the latest RHONY news! Follow us on Twitter @RHONYWetpaint.