updated 05/26/2014 AT 2:00 PM ET
•originally published 05/26/2014 AT 4:35 PM ET
But Khloé Kardashian made sure that her sister Kourtney’s boyfriend, 31, was not forgotten, lightheartedly posting to Instagram side-by-side mugshots of herself and Disick (whom she refers to as LD – Lord Disick).
“Happy birthday to my partner in crime @letthelordbewithyou I love you LD!!” she wrote.
Each mugshot was from a past DUI incident. Kardashian served less than three hours of her 30-day sentence for a DUI in 2008, and Disick was arrested in 2001 for driving while intoxicated in Riverhead, New York.