The couple had a whirlwind romance since going public with their relationship in January last year, and are constantly seen loved up on new Hulu show The Kardashians.
The 43-year-old Kardashian and the 46-year-old Blink 182 star exchanged vows in front of family and friends at a low-key and intimate ceremony in Santa Barbara, California, on Sunday afternoon.
They were spotted in the coastal town in their wedding outfits, as Kourtney opted for a short white wedding dress for her first walk up the aisle.
While the groom added a rock star edge to the event as he sported a pair of designer sunglasses and drove a vintage car on the day, writes the Mirror.
TMZ reported on the big day, writing: "Kourtney Kardashian is a married woman – she just tied the knot with Travis Barker, and this time, they're truly man and wife in the eyes of the law.
"The couple said 'I do' Sunday in Santa Barbara, where they were spotted in traditional bride and groom wear and exchanging vows on the steps of what appears to be the downtown courthouse there on Anacapa."
The report explained that it was a relatively low key event with bodyguards and key witnesses in attendance, and not a huge amount of people.
TMZ added: "Travis was decked out in an all-black tuxedo, and Kourtney had on a white dress that was cut short at the knees.
"Their getaway ride ... a sweet-looking black lowrider convertible, which had a sign strapped to the front grill that reads 'JUST MARRIED'."
The real nuptials come weeks after the couple fooled fans into thinking they had tied the knot in Las Vegas earlier this year.
Kourtney and Travis had caused a frenzy of excitement when they rocked up at a venue in Sin City and swapped vows in front of an Elvis impersonator.
However, the couple didn't have an official wedding certificate at the earlier event, meaning the wedding had not been official.
It was speculated that the stunt at the time was part of Kourtney's reality series, The Kardashians, which airs on Hulu in the USA.
However, the Santa Barbara affair appears far more genuine and now the couple are officially husband and wife.
As photos began to emerge of Kourt and Travis driving off into their future together, sister Kim shared snaps of herself relaxing at home, having recently dyed her hair blonde.
Youngest sister Kylie Jenner shared photos of herself wearing sportswear and relaxing on a private jet with her daughter, Stormi, while clearly not at a wedding and instead flying to the Billboard Music Awards.
And Khloe Kardashian shared photos of herself wearing a midriff baring outfit in a bright purple shade – while again not at a wedding.
Proud mother Kris Jenner also shunned sharing details fo the big day on her own social media channels – preferring instead to highlight make up products.
The nuptials mark the first time Kourtney has ever been married – while Travis was previously married to Melissa Kennedy from 2001-2002 and then Shanna Moakler from 2004 - 2008.
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