Selena Gomez and Benny Blanco 's wedding at the end of the month will be a very private affair ... 'cause we've learned it's happening at an estate, not a hotel.

Sources with knowledge tell us ... the stars aren't getting married at the Rosewood Miramar Beach or San Ysidro Ranch -- two popular wedding venues for the rich and famous in Southern California. Getty

We're told they've rented out a private estate in Montecito ... though it's unclear exactly where in the area they'll be.

While we don't know for sure the reason for the choice of an estate ... it's safe to assume it's for extra security ... after all, when one of the bride's BFFs is Taylor Swift , hotel security just ain't gonna cut it! Gallery Launch Gallery

Besides, an estate sounds a lot more intimate ...

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