Miss Colombia: I'm Vin Diesel's 'xXx' Love Interest!!!

Miss Colombia has extended her 15 ... we've learned she's just signed a deal to become Vin Diesel's love interest in "xXx: The Return of Xander Cage."

Sources connected with the production tell us Ariadna Gutierrez will play Vin's love interest, and her part is not insignificant. She's in 6 scenes and has 3 pages of dialogue.

Our sources say Ariadna's off to the Dominican Republic Tuesday to begin shooting. It will be her first movie role.

Vin's snagged some other people who have recently grabbed headlines ... UFC superstar Conor McGregor will also appear in the flick.