Buy, buy, buy! Or maybe wait a beat.

A fan of Justin Timberlake — and a fan of his actress wife Jessica Biel — can purchase the Manhattan penthouse the married couple once called their own, according to a briefly lived StreetEasy listing update.

Timberlake, the long-standing pop star known among certain generations as a member of the *NSYNC boy band, and Biel — known among that same demographic for her role in “Seventh Heaven” — owned this 443 Greenwich St. aerie, which on Monday returned for sale asking $39.99 million.

But, by Tuesday afternoon — after The Post contacted the listing brokerage regarding the unit — the apartment was taken off-market temporarily, StreetEasy also shows. The listing also doesn’t appear on the website for the brokerage Corcoran, whose press representative di

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