Saint West Pops Up in Cuba for Kardashian Family Vacay

Saint West is already getting a taste of the family biz -- chilling in Cuba for the Kardashian family vacation TV shoot ... and making his paparazzi debut!

It's the first time Kanye West and Kim Kardashian have taken the 5-month-old out in public ... and Kanye looks every bit the doting dad.

Big sis North already looks like a natural in front of the camera -- so we're guessing in another year or so Saint will be freestylin' verses.