Kris Jenner & North West -- Repping for Kanye ... You Gotta Start 'Em Young

Kris Jenner welcomed her granddaughter into the family biz ... of shameless promotion -- and North West's game is strong.

Kris was walking through Heathrow Airport in London with Kim and Kanye West's toddler over the weekend ... and had her decked out in a Yeezus tour jacket. Not to be outdone ... Grandma Jenner was wearing a pair of the new Yeezus shoes.

Bonus points to 21-month-old North for that classic Kanye-esque sneer.