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Reese Witherspoon, Naomi Watts, Jessica Biel, Diane Kruger, Eve Hewson and others came out Friday evening to the Cunard Building in honor of Tiffany & Co.’s 2016 Blue Book collection, titled The Art of Transformation.

Fittingly, the ladies were clad in Tiffany’s finest — Biel wore a diamond bib, “The Knick” actress Hewson layered on a tanzanite and diamond ring with diamond bracelets, and Watts wore a diamond cuff. Witherspoon, who was on hand to celebrate at last year’s bash, sported a $10 million necklace for the evening.

Biel has had a busy week in New York. Her film, “The Devil and the Deep Blue Sea,” premiered at the Tribeca Film Festival on Thursday evening — her husband, Justin Timberlake, was responsible for the film’s music.

Witherspoon has been busy with her clothing line, Draper James. The brand’s first flagship opened in Nashville last year.

Guests were treated to a performance by four-time Grammy-winning jazz artist Esperanza Spalding.