A chic book party was interrupted by an impromptu game of dress-up.

Victor and Athena Calderone hosted pals, including Naomi Watts and Jenna Lyons, at their Brooklyn home to celebrate Athena’s new tome, “Live Beautiful.”

We’re told she took the crew on a tour of the house, and she and designer Wes Gordon ended up in her closet trying on clothes.

Amy Astley, Jane Keltner de Valle and Ulla Johnson also attended, and Robert Mondavi Winery provided the vino.