That's Merrick-raised Debbie Gibson performing as "Night Owl" on the...

That's Merrick-raised Debbie Gibson performing as "Night Owl" on the Feb. 22 episode of Fox's "The Masked Singer."

Credit: FOX

Who was singing ABBA's "Fernando" dressed as the character Night Owl on "The Masked Singer" Wednesday night? As host Nick Cannon breathlessly put it at the reveal, "singer-songwriter, Broadway superstar Debbie Gibson!"

On Instagram afterward, the Merrick-raised Gibson wrote in part, "As I was eating pizza in Newark airport waiting to board my plane to Vegas, grieving on what was the one year anniversary of my beloved Mom’s passing, I never woulda guessed a 5 hour flight, a jaunt home to unpack and repack, a 5 hour drive, and one quick night’s sleep later I would be collaborating on my Night Owl character with the team at @maskedsingerfox and learning Fernando! … Asked to step in on a moment’s notice was such a thrill and a wild adventure. I’m convinced [mom] Diane sent this fun show biz moment as validation that all we ever have to do in life is to 'show up!' ”

Long Island Music Hall of Famer Gibson, 52, whom the Guinness Book of World Records recognizes as the youngest female to produce, write and perform a Billboard No. 1 single, with “Foolish Beat,” has starred in Broadway musicals including "Les Misérables," "Grease" and "Cabaret."

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