The cute 19-month-old tot is seen here looking impossibly cute as he enjoys a game of '1,2,3, weeee'.
Little Mason, whose dress sense is clearly modelled on his father Scott Disick, looked dapper in a white polo with turned-up collar, moss green cargo shorts and baby leather loafers complete with silver horse-bit trim.
Fun and games: Kourtney Kardashian's son Mason looks delighted gets a lift and a swing yesterday in Calabasas, California, yesterday
Lively: The reality star was joined by family and friends as they took Mason to a Barnes and Noble book store
The 32-year-old wore black scalloped-edge shorts for the occasion which she paired with a white t-shirt.
She accessorised with some leopard print sandals and a black leather slouch bag.
Adorable: Kourtney later cuddled her cute little man
Dapper: Little Mason, whose dresse sense is clearly modelled on his father Scott Disick, looked dapper in a white polo with turned-up collar