In his upcoming memoir, “The Company I Keep,” billionaire philanthropist and mega-art collector Leonard A. Lauder pays loving tribute to his mother, founder of the eponymously named Estee Lauder Companies, and shares inside stories about building the prestige beauty empire, including its cutthroat rivalry with Charles Revson of Revlon.

“Over the years, I have been asked to share my stories [and] other adventures I’ve had along the way,” Lauder told us exclusively. “Putting pen to paper has been incredibly fun!”

His tome’s out from HarperCollins in November, and pre-orders start Monday.