Diane Keaton’s son, Duke, is grieving his late mom.

The 25-year-old was seen in public for the first time since the legendary actress died at age 79 on Saturday.

Duke was photographed leaving Diane’s Los Angeles home on Sunday, wearing all black and carrying a backpack on his shoulders. 13

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He subtly honored the “ First Wives Club” icon by wearing two silver cross necklaces, paying tribute to Diane’s signature “devoted nun” style. The look, which she introduced in the 1990s, involved wearing multiple crosses layered together. 13

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Diane adopted her son Duke and daughter, Dexter, 29, in her 50s and raised them as a single mother.

“Motherhood was not an urge I couldn’t resist,” she once told Ladies Home Journal. “It was more like a thought I’d been thinking fo

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