Congratulations are in order for Luke Hemmings because the 5 Seconds of Summer member just announced that he’s engaged to longtime girlfriend Sierra Deaton!

“With shaking hands but a full heart, I proposed to my best friend earlier this year. I love you Thao and I can’t imagine my life without you,” he wrote on Instagram, alongside some pics from the moment he got down on one knee.

 

 
 
 
 
 
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A post shared by Luke Hemmings (@lukehemmings)

According to People Magazine, he popped the question in Malibu, CA, back in February. Deaton added in a post of her own, “It was fun keeping this a secret for so long, but my heart is nearly bursting at the seams. Can’t wait for forever @lukehemmings.”

 

 
 
 
 
 
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A post shared by sierra phương-thảo deaton (@sierradeaton)

How sweet is that?! But wait, when did these two start dating? How long have they been together? And how did they even meet? Not to worry, you guys, because in honor of their engagement, we decided to go ahead and recap their entire love story from start to finish. Here’s a complete timeline of their relationship…

First Off, Who Is Sierra Deaton?

Luke Hemmings Sarah Deaton

Fans may recognize Deaton from her time on The X Factor. That’s right, she actually competed on the third season of the singing competition show, alongside her boyfriend at the time, Alex Kinsey. For those who don’t know, the musical duo, called Alex & Sierra, actually ended up winning the series! They went on to release two albums together, but in 2017, they announced that they had broken up and would no longer be making music together. She has released a few songs on her own since then, and they’re total bops, TBH.

When Did They Start Dating?

The two stars first started dating back in 2018, and they quickly became couple goals — sharing cute pics together, attending events side by side, gushing over each other in interviews and packing on the PDA all over the world. Get this — she even joined Hemmings and his bandmates on their Meet You There and World War Joy tours.

 

 
 
 
 
 
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A post shared by Luke Hemmings (@lukehemmings)

And in 2019, Deaton even called the singer her “soulmate” while wishing him a happy birthday on Instagram. She wrote, “There aren’t enough words to articulate how much I love every ounce of the being you are. Lu, thank you for being my rock through hell or high water, but mostly for telling me everything I cook is the greatest thing you’ve ever tasted lmao. Happy birthday to my very best friend. My soul mate. I love you forever.”

 

 
 
 
 
 
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A post shared by sierra phương-thảo deaton (@sierradeaton)

Who Else Was Luke Hemmings Linked To?

Luke Hemmings

Before he started dating the brunette beauty, Hemmings was briefly linked to model Nadia Mejia. They were spotted holding hands while out in West Hollywood in August 2017, but things must have fizzled out shortly after that, since it was the last we heard of the couple.

Before that, he dated Arzaylea Rodriguez for two years. They first went public with their love in October 2015, and when they split two years later, it was not pretty. Many fans accused her of cheating on Hemmings with Blackbear, but she denied these accusations. She also claimed that her ex’s band was “racist, judgmental and homophobic.” Woah.

He also had a relationship with a girl named Aleisha McDonald before he was famous. They reportedly dated from 2011 to 2013, but broke up when the group had to head to the U.S. to open up for One Direction on their Take Me Home tour.

Who Are His Bandmates Dating?

Luke Hemmings 5 Seconds of Summer

It turns out, Hemmings isn’t the only member of 5SOS to be engaged! Yep, Michael Clifford is currently gearing up to walk down the aisle with his fiancé, Crystal Leigh, and fans couldn’t be more excited for them. According to Us Weekly, they got engaged at the Ungasan Clifftop Resort in Bali — which is where the couple had their first kiss three years earlier.

“I was lucky enough to ask the love of my life to marry me in the place it all began for us,” he wrote on Instagram in January 2019. “In the last three years she has helped evolve and shape who I am in ways I could never have imagined. I couldn’t ask for anyone better to spend the rest of my life with. I love loving you, Crystal.”

 

 
 
 
 
 
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A post shared by michael clifford (@michaelclifford)

As for Ashton Irwin, he’s currently dating fashion blogger KayKay Blaisdell. They have yet to publicly speak out about their romance, but they’ve been photographed holding hands and cozying up on numerous occasions. And although they’re pretty private about their love, Blaisdell did take to Instagram to gush over Irwin when she released his first solo single in 2020. “I’m so proud,” she wrote.

What about Calum Hood, you ask? Well, he’s actually been single since 2016, and he’s even joked about it! In May 2019, he responded to a fan who was making fun of him for being the only one in the group to not have a woman in his life. He replied, “Man y’all just as single as my a** is.”