Billionaire Leonard Lauder has popped the question … again. New York’s “hottest bachelor” is off the market and will marry Judith Glickman sometime next year, Page Six has exclusively learned.

Lauder, 81, dramatically called off his wedding to Brooklyn Public Library president and CEO Linda E. Johnson last August, just weeks before the couple was meant to walk down the aisle. They began dating in late 2012.

But Lauder then moved on to Glickman, 76, a photographer and artist who’s the widow of real estate developer-turned-philanthropist Al Glickman, Page Six reported recently after they were spotted on the town together.

Spies said Lauder, estimated to be worth about $8 billion, broke the happy news to friends over the weekend at the wedding of a couple in Canada who are related to the country’s powerful Desmarais clan.

“Leonard and Judy were at another wedding,” said a source, “and he announced to his table that they were marrying. He and Judy have been friends for 35 years. Her husband died just over a year ago.”

The source added, “Leonard was telling people at the wedding: ‘We’re not engaged — we’re getting married.’ ” Perhaps a sign that this time he’s determined to tie the knot.

A source said Lauder further told pals he and Glickman would get hitched in September. But a rep who confirmed the engagement to us said the nuptials will take place sometime next year.

Another source close to the pair said, “They have known each other for years. They are both widowed. They’re both grandparents.”

Glickman has four kids and 18 grandchildren. Lauder lost his beloved wife Evelyn, whom he married in 1959, in November 2011.

After Lauder and Johnson split last year, the chairman emeritus of Estée Lauder was dubbed as “New York City’s hottest bachelor” by The Post. He was spotted squiring Glickman to an Alzheimer’s Drug Discovery Foundation dinner at Sotheby’s in May, sparking talk of a budding romance.