Sources told us that Libbie was by Pierce’s side at the invitation-only 1640 Society forum and cocktail party — where billionaires and “prominent families” who “summer in the Hamptons” and have “ultra-high net worth family offices” met this week. Also at the intimate event were real estate mogul Kent Swig, venture capitalist Tim Draper, 1-800-Flowers founder Jim McCann, poultry heiress Mitzi Perdue and Anthony Scaramucci — who said it was the first time he’d put on a suit since March.

Spies told us that at the socially distanced event, held outside at Seasons of Southampton, Draper pointed out: “Look around — this crowd is 80 percent women. They are the braver sex that come out safely to meet and talk. Going forward, I’m only going to work with women!” Hedge-funder the Mooch quipped, “I guess I’ll need to get a sex change.”

The cryptic confab is billed as a place where wealthy attendees “compare notes on issues relating to wealth management, asset allocation, governance, impact investing, philanthropy and passing family values to the next generation of leaders.”

A source said of Mugrabi and Pierce, who discussed his platform as an independent candidate at the 1640 event: “The new couple held hands … Brock stayed at Libbie’s house.” They’ve been spotted in NYC and LA together. He previously told Page Six that Mugrabi is a friend.

Meanwhile, Libbie — whose divorce battle has involved a major art collection, a $72 million Manhattan home and the Hamptons spread — told us this week that the brutal breakup recently turned amicable, in part inspired by Gwyneth Paltrow and Chris Martin’s “conscious uncoupling.”