Khloe's birthday bash at Pinz Bowling seemed to be an odd mix of family-friendly fare and the flashy glamour favoured by the Kardashian clan.
Kourtney's own outfit reflected this - a simple grey T-shirt and matching skinny jeans were worn with a metallic gold jacket and black pumps.
Her hair pulled into a sleek and sensible ponytail, Kourtney looked ready for both a party and mummy-duty with Mason.
Kourtney Kardashian looks content as she leaves Khloe's birthday party without bad boy partner Scott Disick!
On Saturday, Kourtney Kardashian traded in partner Scott Disick for a younger man - the couple's son, Mason.
The 36-year-old reality star was spotted at younger sister Khloe's 31st birthday party in the Studio City neighbourhood of Los Angeles.
Her five-year-old son in tow and a girlfriend by her side, Kourtney looked content, even though 32-year-old Scott was nowhere to be seen.
Khloe's birthday bash at Pinz Bowling seemed to be an odd mix of family-friendly fare and the flashy glamour favoured by the Kardashian clan.
Kourtney's own outfit reflected this - a simple grey T-shirt and matching skinny jeans were worn with a metallic gold jacket and black pumps.
Her hair pulled into a sleek and sensible ponytail, Kourtney looked ready for both a party and mummy-duty with Mason.
Khloe's birthday bash at Pinz Bowling seemed to be an odd mix of family-friendly fare and the flashy glamour favoured by the Kardashian clan.
Kourtney's own outfit reflected this - a simple grey T-shirt and matching skinny jeans were worn with a metallic gold jacket and black pumps.
Her hair pulled into a sleek and sensible ponytail, Kourtney looked ready for both a party and mummy-duty with Mason.