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The grieving husband of fashion designer Kate Spade left his Upper East Side building Thursday morning — hiding his face behind a mouse mask.

Andy Spade threw on the bizarre disguise and left his Park Avenue home just after 8:30 a.m. — two days after his wife, Kate, was found dead in the apartment.

The mask — Bernard, voiced by Bob Newhart in the 1977 cartoon movie, “The Rescuers” — depicts the fictional character with a grinning bucktoothed face, black whiskers, wearing a red newsboy cap and matching turtleneck.

Spade, 55, clad in a buttoned-up jean jacket, slowly walked to a waiting black Chevy Suburban while clutching a coffee mug and with a green notebook tucked under his arm.

He ignored a reporter’s questions.

Spade was also wearing a stuffed blue and yellow backpack.

“Do you know the meaning of privacy?” he snapped as he climbed into the SUV.

Kate, his wife of 24 years and longtime business partner, died by suicide Tuesday by hanging herself in a bedroom in her apartment.

Together, the couple created a multimillion dollar empire with their handbag company, Kate Spade.

In a statement, Andy said the two had been living separately for the past 10 months but denied divorce was on the table.

The pair has a 13-year-old daughter Frances Beatrix.