It was the rock show that changed everything.

Kourtney Kardashian announced she and husband Travis Barker are expecting their first baby together during a Blink-182 concert in Los Angeles on June 16. The Kardashians star held up a sign reading, "Travis I'm Pregnant," as seen in a video shared to Instagram, with the drummer coming into the crowd and kissing her in celebration.

It's worth noting that their announcement is a clever nod to the band's 1999 music video for "All the Small Things," in which a fan was seen holding up the same exact message.

Kourtney's pregnancy comes one year after the Lemme founder tied the knot with the musician for a third time in Italy. Their latest chapter together also comes on the heels of the couple documenting their fertility journey during the first two seasons of The Kardashians. In fact, during the show's season three premiere, the soon-to-be mom of four shared that she and Travis decided to take a break from their IVF process.

"We would love a baby more than anything," she explained. "But I just really believe in what God has in store for us. If that's a baby, then I believe that it will happen."

The couple's baby will join Kourtney's three children from a prior relationship with ex Scott Disick: Mason, 13, Penelope, 10, and Reign, 8. As for Travis, he is dad to kids Landon, 19, and Alabama, 17, with ex-wife Shanna Moakler, and is also stepdad to Atiana De La Hoya, 24.

Take a look back at the couple's romance amid their latest chapter together.

Kourtney and Travis are spotted leaving the vegan restaurant Crossroads Kitchen in West Hollywood, Calif. The two friends and neighbors would go on to spark romance rumors several times over the years.

In February 2019, Kourtney and Travis go out to dinner at Nobu in Malibu with her kids and his children. A source later tells E! News, "It was a family dinner. They've been friends for years. They've lived in the same neighborhood for a long time and they see each other at church and with their kids. They've hung out together many times and often get together with the kids to see movies or to get ice cream. They always have fun together. He's a nice guy and their kids really get along well. Kourtney has his kids over playdates and vice versa. They have a really nice friendship."

Kourtney and Travis occasionally hung out over the years, both alone and with other members of their families.

When asked by E!'s Justin Sylvester at the 2019 iHeartRadio Music Awards if it's true that he is dating Kourtney, Travis said, "Oh, that's so funny. She's just a very dear friend."

In January 2021, Kourtney and Travis spark romance rumors again when they both posted photos of the view of her mom Kris Jenner's pool at her Palm Springs-area vacation home. A source later tells E! News that the two have been casually dating since around December.

"It's been very low-key," the insider says. "They are a really good match, and Kourtney's entire family already loves Travis. They have been neighbors and great friends for years, and it just recently turned romantic."

The source adds, "Travis has always had an eye for Kourtney. The chemistry and flirtation has always been there. They have a lot in common, and Kourtney has always been attracted to how Travis is as a parent. He's an amazing, hands-on dad, and Kourtney loves that about him. They love relaxing at home with their kids, and everyone gets along. It's going well, and they aren't putting pressure on it being super serious at this point."

Kourtney and Travis spend Valentine's Day together. Two days later, they become Instagram official when Kourtney posts a photo of their hands intertwined, with her red heart manicured fingers interlocking with his tattooed ones. The blink-182 musician comments with a black heart emoji and also reposts the image on his Instagram Story and tweets, "May we destroy each other completely."

Days later, Travis posts on Instagram a photo of a handwritten note that Kourtney penned to him, which reads "To lots of fun adventures, may we destroy each other completely. Love, [heart scribble] Kourtney."

On Feb. 27, 2021, Kourtney posts on Instagram pics showing her looking totally smitten in what appeared to be Travis' music studio. He comments with a devil emoji and reposts the pics on his Instagram Story.

A source tells E! News that Kourtney and Travis' "relationship is going strong, and Travis has been treating her like a queen. He wants to do everything with her and is so excited about the relationship. It's going really well and Travis' kids love Kourtney."

The source adds, "She's really happy and is having a lot of fun. They are planning a few more getaways together in the next coming months. Kourt is also helping Travis on his wellness line, and he loves hearing her input on the project."

Travis gushes about Kourtney (and her love note) on The Drew Barrymore Show. He says, "Up until now, I would, you know, date girls that didn't have kids, and I find it kind of hard. I think they would have trouble understanding, 'Well, 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 mom; who's, like, a great friend. And I just, you don't have to worry about any of those things. It just comes natural. It's like a maturity thing."

On March 19, 2021, Travis posts on his Instagram Story a photo of a white plate with the words "Travis [heart] Kourtney" written in chocolate syrup.

Kourtney wears a naughty T-shirt on a date with Travis to Nobu in Malibu, Calif. on March 19, 2021. They two visited the restaurant together with their families back in 2019.

A day later, March 20, 2021, Kourtney and Travis returned to Nobu for another dinner date.

Travis pays tribute to Kourtney on her 42nd birthday with this lavish display of white tulips and gardenias, her favorite flowers...

...and also posts an Instagram tribute to his girlfriend, including a rather NSFW video.

The lovebirds share another social media hug over Kourt's birthday weekend.

"Little birthday vibes," Kourt shared after her birthday celebrations.

Kourtney and Travis hang with Machine Gun Kelly and Megan Fox during MGK's birthday celebrations with friends.

"Just Like Heaven," Kourtney shared with a sizzling snapshot from her birthday vacation in the desert.

The lovebirds enjoy a date at NoBu in Malibu.

On Mother's Day 2021 (May 9), Kourtney showed off her extravagant floral gifts from Travis on Instagram Stories.

Kourt and Travis hold hands while riding a merry-go-round

Travis made his love for Kourtney permanent with a special "I Love You" tattoo.

The lovebirds enjoy a Disneyland date with their kids on May 20.

The musician showered his girlfriend with three gigantic, lavish bouquets of pink and greens flowers.

How cute is their PDA?

The couple keeps each other close outside the It's a Small World ride.

The two are spotted making out outside a studio in Burbank, Calif.

The rocker his his lady tight during the PDA photo opp. "She likes riding with the top down," Travis posted on June 18, 2021.

The two are spotted at their second UFC event together, UFC 264.

Kourtney shared this steamy selfie with Travis on Aug. 4. "Ten days of quarantine…" she captioned the series of snapshots. Travis commented with a heart emoji, writing, "10 days with you."