NY Daily News – Which publicity-loving socialite has a set of parents-in-law who can’t keep up with their bills? The Upper East Side couple keep moving from apartment to apartment to avoid paying their obligations, including more than $30,000 in medical bills. One posh Park Avenue doctor has even hired a private investigator to track down the pair’s current residence to get them to pay up. Their daughter-in-law still thinks they’re flush with cash and, even though she doesn’t have any income of her own, continues to spend, spend, spend.

IDK
I would say Nikki Hilton but it says parent in laws..
Tinsley Mortimer?
Kim Kardashian?
Is ‘can’t keep up with the bills’ a hint – Keeping Up With the Kardashians??
Heidi Montag? But you would think they would’ve mentioned the recent “marriage”…
Kardashian, Montag; how could either be considered a “socialite”, also, not Hiltons because they are not married.
Tinsley Mortimer is a very good guess. She is a socialite who loves publicity, is married to a man who comes from money, and lives on the Upper East Side. And “posh Park Avenue doctor” could be a clue since she was featured in the book ‘The Park Avenue Diet’.