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Selena Gomez and Benny Blanco are saying "I do" this weekend and PETA's already RSVP'd with a wedding gift that screams animal-friendly luxury.

TMZ has learned the org shipped the couple a fully vegan take on Benny's favorite dish ... the bougie chips-and-caviar combo. The gift basket includes Lay's, a recipe for dairy-free crème fraiche, chives and a plant-powered caviar swap from Cavi-art. PETA

PETA sent a letter giving Selena a playful nod, reminding her she made her distaste for traditional fish eggs clear on "Selena + Chef." The animal rights group says this swap might just have her singing, "I Can’t Get Enough." Document Launch Doc PETA

PETA's Senior VP Lisa Lange tells us ... "Anything and everything can be made vegan these days, and this animal-frien

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