While the news may seem like a surprise, the couple has been building their relationship for years.
February 2015: ‘Just Friends’
The pair was photographed leaving New York hotspot Up & Down early one morning in February. Earlier that same day, Baldwin told reporters at the Fendi New York flagship store launch that she was single.
“We’re just friends. I’ve known him for a long time, since I was about 13,” Baldwin told E! at the amfAR New York Gala. “He’s just going through a time in his life where he’s transitioning in a really positive way and he needs good people around him. And I’m trying to be a good friend and be there for him and support him.”
January 2016: Vacationing Together (and Making Out!) in St. Barts
The duo took a tropical vacation together with Bieber’s siblings and father Jeremy, but it wasn’t until the pop singer posted a photo of them locking lips at Leonardo DiCaprio’s St. Barts New Years Eve party that it was confirmed that they were really more than just friends.
May 2018: Rekindling Their Relationship After Splitting
The model recently opened up to U.K. newspaper The Times about going their separate ways in 2016.
“Justin and I were friends for a long time. I met him when I was really young and he was one of my best friends. Everybody knows that at a certain point in time that turned into something else, but that just happens when you’re 18, 19. It was what it was,” she explained, adding that after their relationship status changed “we went through a long period of time when we weren’t friends.”
She added, “We didn’t speak for quite some time and there was a lot of weirdness that went on” but that “we’ve moved past that.”
June 2018: Spending (Nearly) Every Moment Together
A few weeks later they were seen together again—this time attending a church conference in Miami before heading to LIV nightclub.
The next day they were spotted helping one another towel off after a refreshing dip in the water.
They then made their way to New York City where they were seen leaving Bieber’s hotel and made a Starbucks run while getting goofy with onlookers.
By the following week, there was no question that they were more than just friends. Baldwin and Bieber were seen making out in Brooklyn’s Domino Park in a video obtained by TMZ.
The stars continued their PDA spree in Manhattan later that night, kissing in Rockefeller Park as Baldwin sat on Bieber’s lap.
Days after they were photographed holding hands while out and about in New York City, they were spotted attending a service at Churchome Church in the town of Kirkland, Washington, and later enjoying some time in a hot tub together.
RELATED VIDEO: Justin Bieber and Hailey Baldwin Hit Washington State for Church and a Hot Tub Session
July 2018: Looking Happier Than Ever
The romance continues!
Bieber was seen kissing Baldwin on the forehead back in N.Y.C.
The couple then headed out to the Hamptons for the rest of the weekend. In photos obtained by the Daily Mail, Bieber and Baldwin were seen cuddling in Sag Harbor. “Mood for the rest of the summa,” the model captioned a photo of herself in the water.
Back in the city, they were most recently seen walking hand-in-hand in N.Y.C. following a dinner at Nobu.
July 7, 2018: Engaged!
Bieber and Baldwin got engaged in the Bahamas during dinner at a local restaurant.
And Bieber’s mother Pattie Mallette also referenced her son’s engagement on Twitter, writing, “Love Love Love Love Love Love Love.”
“It’s kind of a surprise, but kind of not. Justin has been extremely happy these past few weeks,” a source told PEOPLE. “He has known Hailey for a long time. This might seem sudden, but they know each other very well.”
Two days later, Bieber confirmed the engagement on Instagram.
“Hailey I am soooo in love with everything about you! So committed to spending my life getting to know every single part of you loving you patiently and kindLY,” Bieber wrote on July 9. “I promise to lead our family with honor and integrity letting Jesus through his Holy Spirit guide us in everything we do and every decision we make. My heart is COMPLETELY and FULLY YOURS and I will ALWAYS put you first! You are the love of my life Hailey Baldwin and I wouldn’t want to spend it with anybody else.”
July 2018: Basking in Engagement Joy
Following the proposal in the Bahamas, the pair returned to N.Y.C. on July 10.
“They wanted to stay in the Bahamas for as long as possible,” a source previously told PEOPLE. “They were having the best time. They’re just enjoying being engaged. They know when they leave, there will be a lot of attention on them.”
According to The Blast, Bieber and Baldwin stopped at Pristine Jewelers in N.Y.C., days after returning from their vacation so she could buy her man a diamond-encrusted ring with his initials, “JB.” In addition to Bieber’s new bling, Baldwin reportedly also bought herself another custom-made ring for herself with the word “Baby” written across it, which could possibly be a nod to her fiancé’s 2010 hit single.
On July 13, a source told PEOPLE the couple had already begun planning their nuptials.
“As of now, they want a small ceremony with their families,” a source close to Bieber told PEOPLE at the time. “They are not planning a huge, celebrity wedding. They are getting married for love and don’t want a flashy wedding.”
Bieber and Baldwin spent much of July out and about around New York.
“He told his waiter, ‘She’s hot. I did well, huh?’ And Hailey was all smiles,'” Bastos told PEOPLE after. “I’ve never seen anyone so happy. He was all smiles; proudly looking at her and saying she’s hot and how lucky he is and how he did well. She was giddy. They were adorable.”
After Bieber and Baldwin’s summer PDA tour, paparazzi caught an emotional afternoon for the couple when photographs of the two crying during an N.Y.C. bike ride surfaced on Aug. 7.
Days later, a source told PEOPLE Bieber is simply overwhelmed by his love for his fiancée.
“Justin being emotional has nothing to do with him not being happy. It’s the opposite. He is the happiest he has ever been,” said a source close to Bieber. “He wonders if he deserves the happiness, and that’s partly why he is emotional.”
In mid-August, a source told PEOPLE that the pair was pumping the brakes on planning their religious wedding ceremony.
“The wedding planning has slowed down a bit,” a Bieber source tells PEOPLE at the time. “They still don’t want a long engagement, but they are also not rushing the wedding. … It was getting quite intense. … They aren’t slowing things down though because they are unsure if they want to marry; they definitely want to get married.”
September 2018: They’re Married!
Baldwin took a break from modeling jobs during New York Fashion Week shows, and on Sept. 10, she told WWD she would be more selective with projects she does to spend more time with Bieber.
“I’ve tried to be really choosy with fashion week going forward, just because I want to have the time to spend being relaxed and being with family — and my fiancé,” she said.
That same day, Bieber spent some one-on-one time with his future father-in-law, Stephen Baldwin.
On Thursday, Sept. 13, Bieber and Baldwin were seen at a courthouse where they issue marriage licenses.
“They have hired a wedding planner and have been looking at venues,” a friend of Bieber’s told PEOPLE at the time. “The plan for now is to have a real wedding.”
Then, on Sept. 14, PEOPLE confirmed Bieber and Baldwin got married Thursday in New York City. “They went ahead and did it without listening to anyone,” a source close to the couple said.
A religious source confirmed to PEOPLE that they were legally married at the courthouse, but are going to have a religious ceremony and celebration with family and friends soon. “They’re going to have a big blowout, in front of God and everyone they love,” the religious source said.