Kourtney Kardashian's son Mason, 14, towers over her in LA

's eldest child - son Mason Disick, 14 - towered over her while stepping out on a grocery run in .

Kourtney - who stands at five-feet-tall - went to the store with Mason and her daughter Penelope, 12, on Monday.

Kourtney, 45, shares Mason, Penelope and Reign, nine, with ex-partner .

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