The couple had three weddings in the past year, this one a lavish ceremony in Portofino, Italy.
Barker's representative confirmed the wedding to USA TODAY after the musician's teenage daughter, Alabama, shared images of her father and Kardashian, clad in a white gown and veil, at the altar.
Kardashian and Barker officially tied the knot May 15, according to photos posted by the Poosh founder. Hours before Sunday's Italian wedding, Kardashian shared photos of herself in a short black corset gown and a matching wedding veil. "Here comes the …," she captioned the post.
But for the couple's nuptials, Kardashian kept it traditional as she donned a white Dolce & Gabbana minidress with an embroidered cathedral-length veil. "happily ever after," she captioned the photo.
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In another Instagram post, Kardashian shared more photos of the happy couple from the altar, writing: "Introducing Mr. and Mrs. Barker."
Barker's daughter also shared more videos on her Instagram Story from the wedding reception party. Kardashian changed into an edgier look for her third dress of the weekend, donning a black minidress similar to the one she wore for her wedding ceremony. She paired it with a more simple veil of the same color.
In another video, Kardashian and Barker are seen dancing along to "At Last" by Etta James. "This is our dance," Kardashian says in the video as Barker kisses her.
For that ceremony, Kardashian chose a white strappy minidress with a red heart adorning the bodice and a traditional veil. She wore her hair up and kept the glam and accessories simple. Barker kept things classic and was pictured in an all-black tuxedo.
The couple's whirlwind Santa Barbara wedding came a little more than a month after the two had a symbolic wedding ceremony after the Blink-182 drummer's Grammy Awards performance in Las Vegas.
On April 6, Kardashian shared photos on Instagram from the big day. The series of pictures showed the couple wearing sunglasses and decked out in leather, standing before an Elvis impersonator. Kardashian held a bouquet of red roses.
"Found these in my camera roll," Kardashian captioned the post. "Once upon a time in a land far, far away (Las Vegas) at 2am, after an epic night and a little tequila, a queen and her handsome king ventured out to the only open chapel with an Elvis and got married (with no license). Practice makes perfect."
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Kardashian and her sisters Kim, Khloe, and Kendall Jenner, as well as mom Kris Jenner, appeared on "Jimmy Kimmel Live" after her announcement, where they discussed the spontaneous trip to the chapel. "I knew and Khloe knew," Kris said. Khloe added, "I was on FaceTime."
The rest of the family discovered Kardashian and Barker had a Vegas wedding after she posted in their group chat. "I was sleeping," Kim revealed, adding, "She put it in the group chat, like, 'Oh, hey, guys, by the way, I got married last night.' And I woke up to like a million texts. I was like, 'What?' "
The two weren't legally married in Vegas because they couldn't get a marriage license on time. Kardashian told Kimmel: "There was no possibility to get a marriage license at that hour. ... I'm like, 'Are you guys lying?' We asked like five times, 'What do we have to do to make this happen?' And they were like, 'It opens at 8 o'clock.' We just did it anyways. It's what's in the heart."
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Kardashian and Barker announced their engagement in October, eight months after making their relationship Instagram official, days after Valentine's Day.
Both already have children, and the couple has been open about wanting to get pregnant in the new "Kardashians" show. Kardashian shares sons Mason 12, and Reign, 7, and daughter Penelope, 9, with ex Scott Disick. Barker shares son Landon, 18, and daughter Alabama, 16, with ex-wife Shanna Moakler. The Blink-182 drummer has also remained close to stepdaughter Atiana, 23, whom Moakler, 47, shares with Oscar De La Hoya.
Contributing: Rasha Ali, Edward Segarra and Pamila Avila
This article originally appeared on USA TODAY: Kourtney Kardashian, Travis Barker married in lavish Italian ceremony