Kim Kardashian accidentally gets sister Kourtney's age WRONG in birthday card: 'My bad'

Kylie Jenner Rocks Pink & Red Crochet Bikini On Kourtney’s Birthday Getaway In Palm Springs — Watch

Travis Barker Says He 'F**king Loves' Kourtney Kardashian, Shares PDA-Filled Birthday Tribute

Kourtney Kardashian turns 42! Kim and mother Kris Jenner post gushing tributes