David Harbour and Lily Allen recently showed off their 'weird and wonderful' Brooklyn townhouse. Here's a complete timeline of their relationship.

According to People, the "Stranger Things" actor and Allen attended the BAFTA tea party together in January 2019, thus sparking speculation over the nature of their relationship.

E! News reported at the time that the "Smile" singer and Harbour caught an evening performance of a play at London's Piccadilly Theater, and later took a post-show walk and dined together.

Harbour hosted "Saturday Night Live" in October 2019. Shortly after his episode aired, Allen posted a closeup photo of Harbour's muscular arms (taken from a Soul Cycle parody sketch) to her Instagram stories, with the caption "Mine."

As People reported at the time, Allen also accompanied the "Stranger Things" star to the "SNL" afterparty, and the happy couple was photographed kissing while walking around New York City the following day.

Harbour and Allen were photographed walking the red carpet at the Skin Cancer Foundation's Champions for Change gala, alongside other celebrities like Sebastian Stan and Katie Holmes.

The actor shared a selfie of himself and Allen at Disney (taken in the reflection of a parking lot mirror) to his Instagram account. In the photo, Allen adjusts her princess costume, while Harbor, who appears to be wearing a cape, smiles at the camera.

"The prince, princess and the parking lot. That seven dwarves mine ride is the best one in the whole damn park. Go on, fight me. #magic #disney #rule breakers," Harbour captioned the image.

People reported that Allen was spotted wearing a ring on her left-hand ring finger in late November of 2019, subsequently sparking speculation over the status of her romance with Harbour.

At the time, neither Allen nor Harbour's reps commented on the speculation, as reported by People.

In a collage of photos the actor shared to his Instagram account, Allen and her two daughters are shown sitting at a table surrounded by confetti, balloons, and a "Happy Birthday" banner. Harbour also gave followers a glimpse at his homemade birthday cake, which was topped with fresh berries.

"To all the friends and fans that reached out with birthday wishes yesterday, thank you, so happy to have so so so so many people out there tracking my race to being infirm and embarrassingly saggy all over. And to those that didn't, you're heartless jerks," Harbour wrote in part of his caption.

Harbour shared several sweet snapshots from the day, including one of him holding Allen (clad in a short white dress and black heels) and posing with their officiant, whom the actor revealed was an Elvis impersonator.

"In a wedding officiated by the king himself, the people's princess wed her devoted, low born, but kind credit card holder in a beautiful ceremony lit by the ashen skies courtesy of a burning state miles away in the midst of a global pandemic," Harbour captioned the post.

He also included a photo of the couple and Allen's daughters eating In-N-Out burgers after the ceremony, which he jokingly described as a "small reception."

During a 2021 appearance on "Jimmy Kimmel Live!," Harbour explained that he and Allen got engaged "right before the pandemic" began in 2020.

The "Black Widow" star also told Kimmel how their engagement came to be.

"We were riding bikes, out in the country, trying to figure out what we were going to do for the next year... and the little one was riding along and she was going like, 'David, dad, David, dad.' Because the D got her confused," Harbour explained."And the older one got very upset with that, which I understand. She was like, 'He's not our dad! He's not our dad!'"

"And then the younger one was like, 'Well what is he? He's kind of our dad.' She's like, 'No he's not, he's our stepdad.' And she goes, 'What is he?' And she goes, 'He's just some guy in our lives!'" Harbour continued.

Per the actor, the conversation between Allen's daughters made him realize he needed to marry the singer.

Allen (who appears to have wiped her Instagram of all posts before February 2022) reportedly shared several photos with Harbour to commemorate their first anniversary.

Among the photos were snapshots from their Las Vegas wedding, and a video of Harbour dancing, per People.

"1 year down with this guy. Happy Anniversary baby @dkharbour," Allen wrote at the time, according to People. "I prefer my life with you in it. You can stay."

Allen shares two daughters with her ex-husband Sam Cooper: Ethel Mary, born in 2011, and Marnie Rose, born in 2013.

Since beginning a relationship with Allen, Harbour has posted photos and videos with the girls to social media numerous times. The blended family made their first appearance as a unit at the "Stranger Things" premiere in Brooklyn in 2022.

To mark the occasion, Allen posted a photo on Instagram of herself and Harbour staring lovingly into each other's eyes and captioned it simply: "Happy Anniversary @dkharbour. Love ya."

Harbour and Allen's Brooklyn home was featured in a February 2023 Architectural Digest article, and the couple gave the magazine some insight into how they landed on their colorful, eccentric abode.

"I tried to reach for something weird and wonderful," Allen told the publication of her work with interior designer Billy Cotton on the home. And Harbour, for his part, praised Allen's "vision."

But Allen also revealed that her daughters have strong opinions on the home.

"My kids call this the clown house, but they say it in the most loving way," the singer said.