Kourtney Kardashian and Travis Barker are engaged. Let's take a look back at their relationship.

Kourtney Kardashian and Travis Barker are undoubtedly one of the most unexpected celebrity couples of 2021. 

Since becoming official in February, the Poosh founder and Blink 182 drummer have quickly become notorious for sharing PDA-filled snaps of their relationship on social media and confusing fans with wedding rumours.

...Until today.

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Early on Monday afternoon, Instagram user @blakekirsch shared the news of Kourtney Kardashian and Travis Barker's engagement after watching it go down on Miramar beach.

"So I just watched @kourtneykardash and @travisbarker get engaged tonight. You heard it here first," he wrote.

"I saw [them] walking in, and I thought something was up. @jeffleatham was doing a flower field on the beach, so I knew it was going to be an engagement. It was so beautiful! Love to see a love story unfold in front of my eyes.

Kourtney has since shared an image of her and Travis surrounded by roses on the beach, captioning it simply: "forever".

Here's everything else we know about their relationship.

Kourtney Kardashian and Travis Barker have actually known each other for years. 

Having both lived in Calabasas, California, for a long time, the musician and reality TV star became friends through mixing in the same circles. Barker knows the Kardashian family well and has previously appeared on Keeping up with the Kardashians.

In 2019, after being spotted at dinner together with their kids, relationship rumours started swirling. However, Barker denied them.

"Kourtney’s like a dear friend. That’s it... I mean, I love her to death. I love her family to death. But yeah, just friends," he told People.

Two years later, that all changed.

In January 2021, followers of Kardashian and Barker noticed they both posted Instagram Stories at Kris Jenner's Palm Springs home.

Image: Instagram. 

Soon after, a source confirmed their holiday together and relationship status, telling People: "They're in Palm Springs together. They've been dating for about a month or two. They've been friends for a long time but it's turned romantic. Travis has liked her for a while."

Another source told Entertainment Tonight how Scott Disick - Kourtney Kardashian's ex-partner and father of her three children, Mason, 11, Penelope, 9, and Reign, 6 - felt about her new romance.

"It's always a bit of an adjustment when one of them is dating someone new, but at the end of the day, he obviously wants Kourtney to be happy and they're focused on co-parenting together," they said.

After back-and-forth banter on social media, Kardashian made their relationship official in February, posting a photo of her holding hands with Barker on Instagram.

While Barker shared a note from his new flame on his Instagram Story, which read: "To lots of fun adventures, may we destroy each other completely. Love Kourtney."

Image: Instagram. 

During an appearance on The Drew Barrymore Show in March, Barrymore discussed the note saying: "My love note would be like, 'Can we get to bed early and watch a movie?'"

"I would prefer the opposite. I would prefer to, kind of, go in the blaze of glory and ball of flames," Barker responded.

Barker who also has two children with his ex-wife, Shanna Moakler - Landon, 17, and Alabama, 15 - opened up about dating partners who have kids and those that don't.

"I've done both up until now. I dated girls who didn't have kids and I find it hard because they would have trouble understanding like, 'Why don't you want to go to dinner every night with me?' or 'Why don't you want to see me every night?' And now I'm spending time with a woman who's a great mum, who's a great friend and you don't have to worry about any of those things," he told Barrymore.

"It just comes natural, it's like a maturity thing," he added.

After announcing their relationship, the couple started regularly posting gushy, PDA-filled photos together.

Barker also got three tattoos - one inked by Kourtney saying "I love you", another in her handwriting saying "You're so cool" and finally, "Kourtney" across his chest.

Speaking to E! News, a source shared that both of their children love the relationship too.

"Kourtney has become very close with Travis' kids recently," the source said, adding that she's been "a huge support system."

Feature image: Instagram/ @notskinnybutnotfat