Nick Zano Branded his GF Kristin Cavallari!

Before sending Kristin Cavallari off to Miami last week for a wild spring break, her boyfriend Nick Zano - who was left behind in New Orleans, where he's filming "College" - branded his girl. "He wants the other guys who flirt with Kristin to know she's all his," said an insider, who got a peek at the "Laguna Beach" girl's new wrist tattoo during a Victoria's Secret Pink event on the beach. Our spy said the body art displays his initials, "NZ," in black ink. When asked about it, Cavallari "got really giggly and started blushing."

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