Kourtney Kardashian is taking a sweet trip down memory lane.

In honor of her stepson Landon Barker's 20th birthday, the Kardashians star—who wed Travis Barker in 2022—posted a few snapshots of the "Friends With Your EX" musician, including one throwback photo dating back to way before she and Travis became a couple.

In the pic shared to her Instagram Stories Oct. 9, a younger Landon is seen making a piece sign alongside Kourtney's oldest son Mason Disick, now 13, captioning her post, "how is this 2017."

And that's not all, as the Poosh founder—who shares kids Mason, Penelope, 11, and Reign, 8, with ex Scott Disick—also posted a TikTok of her and Landon, along with the caption, "HAPPY BIRTHDAY @landonasherbarker I can't believe you're 20!"

Kourtney—who is pregnant with her and Travis' first baby together—also followed up their TikTok with another photo of her, Travis and Landon at Coachella. Alongside the photo of the trio, she added an arrow pointing toward her stomach, writing, "baby Barker."

As for Travis himself? The rocker—who is dad to Landon, Alabama, 17, and stepdad to Atiana De La Hoya, 24, with ex Shanna Moakler—shared a special shoutout to his "mini me."

"Happy Birthday to the most amazing son I could ever ask for," he captioned his Instagram post featuring a series of throwback photos of Landon. "I can't believe you're 20! The day you were born you made me a better person and you have filled my life with so much happiness. I'm so proud of the man you have become and I love you."

Keep reading for a look at their cutest pics together as a blended family.

Kourtney posted a photo of her baby bump in June 2023, a week after she and Travis publicly shared that they're expecting.

Kourtney shared a close up of this sweet throwback of Alabama and Penelope for Alabama's 17th birthday.

Alabama snaps a silly selfie with Kourt, Penelope and sister Atiana De La Hoya during the festivities.

Kourtney and Alabama pose for another sweet selfie.

Kourtney, Travis, Alabama, Atiana, Landon and Reign posed at Disneyland on April 18 for Kourtney's 43rd birthday celebration. 

Kourtney, Travis, Alabama, Atiana, Landon and Reign spent the day at the Happiest Place on Earth on April 18 in honor of Kourtney's 43rd birthday.

Landon, Atiana and Kourtney posed together while enjoying a day at Disneyland for Kourtney's 43rd birthday on April 18.

Penelope the artist! Travis shared her drawing of him on March 6. 

Kourtney, Travis (wearing an Enfants Riches Déprimés sweater), Mason, Alabama and Atiana watched Landon model in the AMIRI Autumn-Winter 2022 Runway Show in Los Angeles on Feb. 8, 2022.

On Christmas Eve, the Kardashian-Jenners joined the Barkers for a night of celebrations.

Travis and Penelope enjoyed a game of checkers, alongside Kourtney and MJ who watched the pair.

For Alabama's 16th birthday Dec. 24, Kourtney and Travis surprised her with balloons that spelled out BAMA 16. As her dad wrote in the caption, "I LOVE YOU SO MUCH!!!"

Travis appeared with Kourtney and Penelope in a TikTok video posted on the mom and daughter's joint account.

"So happy for you guys," Travis's daughter Alabama wrote on a photo of the Blink-182 drummer and Kourtney as they celebrated their engagement. "I love u both!"

Travis' 17-year-old son Landon Barker joined his dad and Kourtney for some Halloween fun at Knott's Scary Farm in Southern California.

Seeking out more spooky scenes, Kourtney recruited her 11-year-old son Mason Disick for a trip to Universal Studios' Halloween Horror Nights with Travis and his daughter Alabama.

Travis' stepdaughter and Alabama and Landon's half-sister Atiana De La Hoya posed as the Bride of Frankenstein to Reign Disick's Frankenstein.

Kourtney's daughter Penelope Disick rocked a devil costume for yet another family Halloween outing in early October. This time, the crew headed to immersive L.A. jack-o-lantern experience, Nights of the Jack.

During their Nights of the Jack adventure, Alabama captured Travis and Penelope sharing a sweet moment as he walked around carrying her on his shoulders.

Even before they were dating, Travis and Kourtney were friends for years. Just look at this throwback photo of Mason, Landon, Alabama and Penelope from 2017 that the Keeping Up With the Kardashians star shared in honor of Landon's 18th birthday in October 2021! 

Talk about a sweet birthday present! Travis gifted Kourtney's daughter Penelope a state-of-the-art drum set when she turned nine back in July.

What better place to spend the Fourth of July than Disneyland? The happy couple celebrated the holiday there with Landon, Alabama and Reign.

Atiana opted to twin with Kourtney in matching snow gear during their first family trip together in Deer Valley, Utah back in April 2021.

Who needs to hit the slopes when you've got snowmobiles? Alabama joined in on the fun in this candid snap of her, Kourtney and Atiana.

Reign struck a pose while on Alabama's back atop Deer Creek's beautiful mountains.

Like his sister, Landon made sure to get his own photo with Reign.

The family that TikToks together, stays together.