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A couple getting hitched in a fancy wedding at St. Patrick’s Cathedral on Saturday, followed by a party for 400 at the Plaza, is refreshingly donating their wedding registry to charity.

Ernesto Arguello — who previously dated Eva Longoria — is marrying philanthropist Ashley Taylor Cooper in a ceremony that will include a Naeem Khan dress and a 7-carat diamond wedding ring.

But they are not accepting gifts, and their wedding registry, we hear, is strictly for donations to an “educational center for underprivileged children.”