Real estate maven and “Shark Tank” star Barbara Corcoran is looking to expand her empire — specifically, with the purchase of her own $10.99 million private island.

Known as Tavern Island, off the coast of Rowayton, Conn. — with views of the city skyline — it was, as we previously reported, home to European settlers in 1651, and a popular party spot for Marilyn Monroe and Barbra Streisand 300 years later.

Rick Higgins, of Higgins Group Real Estate, has the listing.

In April, The Post reported exclusively that Corcoran and her husband bought a $10 million duplex penthouse at 1158 Fifth Ave. that was originally asking $14.5 million.

(Bruce Littlefield  is now helping her decorate.)