Other snaps gave a closer look at her dress, a short white number featuring a red heart on the bodice as they shared a kiss in their convertible, which was decorated with a "Just Married" sign on the bumper.
The couple shared the same caption on their posts, writing, "Till death do us part."
Barker and Kardashian got engaged in October last year in Montecito, California, after dating for less than a year.
The sweet moment was captured on camera for The Kardashians, with the celebration continuing with a surprise dinner for their families.
They previously took part in a commitment ceremony, which was not legally binding, after the Grammy Awards at around 2am at One Love Wedding Chapel, with an Elvis Presley impersonator officiating.
The reality star and the drummer finally made their marriage official on Sunday with a few close friends and family members attending.
A source told People: "They had to legally get married first ahead of their big Italian wedding, which is happening very soon.
"All the details are set and the whole family, including all the kids, are very excited."
