Heidi Klum's ex Vito Schnabel, 37, marries Helena Althof, 21, in NY

is officially off the market after tying the knot with Helena Althof.

The art dealer, 37, quietly exchanged vows with the 21-year-old Russian model last week in a private ceremony in Old Westbury, NY, according to .

'……oops….' wrote Althof on Instagram with of herself in her wedding dress and other snapshots from the wedding.

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