Elizabeth Olsen surprised fans when she revealed in 2021 that she has already tied the knot with her musician fiancé, Robbie Arnett. The WandaVision actress casually announced the news in a conversation with Kaley Cuoco for Variety, referring to her partner of four years as her now-husband. "I also just noticed that my husband put Little Miss Magic. You know, the Little Miss books?" Elizabeth gushed. "They're these classic books but 'magic' because of WandaVision because he's such a f**king cutie!"

The ultra low-key pair first sparked rumors of a romance in March 2017, after they were spotted walking arm-in-arm around NYC. They made their first public appearance as a couple at a pre-Emmys party later that year, and soon confirmed that they have moved in together. By June 2019, it was reported that the two were already engaged after three years of dating. Below, we break down everything we know about Elizabeth Olsen's husband, and their relationship.

8 Robbie Arnett Is Part of A Band

Robbie Arnett, 30, is the lead singer and co-founder of the indie pop band Milo Greene. He and fellow member Andrew Heringer formed the group when they were still going to college back in 2010. "We were in separate bands," Robbie told NPR in 2012. "And we wanted to sound a bit more professional, I guess. We wanted a booking agent, a manager, so we created a Gmail and starting sending people emails, calling people, on behalf of Milo Greene."

Based in Los Angeles, the four-piece act is known for "their signature walls of vocal harmonies, nostalgic lyrics, and haunting soundscapes," according to their official website. The group first gained momentum when they toured with the music duo The Civil Wars back in 2012. Since then, Milo Greene has released two EPs and a full-length album, along with a couple of hits such as "1957", "On the Fence", "Silent Way", "What's the Matter", and "Move."

As a member of Milo Greene, Robbie Arnett has been featured on the soundtrack of several TV shows and movies, such as the popular CW series Supernatural, the hit Netflix show The Santa Clarita Diet, and the 2020 coming-of-age film The F**ck-It List.

Speaking with CBS, member Marlana Sheetz said, "Originally, when we started this band we wanted to create music that we could potentially see being placed in movies and TV. We really love scoring and that's how we wanted the music to sound." The group has likewise been featured on several late-night shows such as The Late Show With David Letterman, The Tonight Show with Jay Leno, and most recently, Conan O'Brien's Conan on TBS.

As a solo artist, Robbie Arnett had worked on the 2019 film Jexi starring Adam Devine and Rose Byrne. He is credited on IMDB as the music coordinator of the movie.

Related: These Movies And TV Shows Prove Elizabeth Olsen Is So Much More Than Just A Marvel Star

6 When Did Robbie Arnett And Elizabeth Olsen Start Dating?

Robbie Arnett and Elizabeth Olsen were first spotted together in the fall of 2017, wearing matching neutral outfits while taking a romantic stroll in New York City. At the time, the sister of twins Mary Kate and Ashley was already two years separated from her former fiancé, Narcos star Boyd Holbrook. The ex-sweethearts, who reportedly got engaged in March 2014 in Paris, were all set to tie the knot when they suddenly called off wedding plans in January 2015, much to their fans' dismay.

Nonetheless, the WandaVision star would go on to find new love in Robbie; the two reportedly first crossed paths in February 2017, while on a vacation in Mexico. Previously, an insider close to Elizabeth described the indie musician as a "great guy."

"They are in an exclusive relationship," the source said. "And Lizzie is excited about him. She deserves it. It's very new though, but they seem to like each other a lot already."

5 How Long Have Robbie Arnett And Elizabeth Olsen Lived Together?

Appearing on The Late Late Show with James Corden in May 2018, Elizabeth Olsen, 33, confessed that she has already moved in with her then-boyfriend Robbie Arnett. "Yeah, we live together. Yeah, it already happened," she admitted. "[But] not very long ago. [Just] a couple of months ago."

She also showed a photo of her during the moving process, posing inside a U-haul van while lying on a huge mattress. "I have a guest bedroom and I have been putting off making it an actual bedroom so people don't sleep over. And then my boyfriend and I were like, 'Why don't we just move the mattress from his place into the house?'" Elizabeth told host James Corden. "So that's how we moved in."

When told that she is making a huge commitment by moving in with Robbie, the MCU cast member quipped, "Yes. We now have two mattresses in our home." "I think it's a bigger thing than that," James then said.

Related: Is Elizabeth Olsen Single? Here's What We Know About Her Dating History

4 Robbie Arnett Relocated To London For Elizabeth Olsen

Robbie Arnett joined his then-girlfriend Elizabeth Olsen when the actress moved to London to shoot Marvel's Doctor Strange in the Multiverse of Madness in 2021. The couple stayed in Richmond, a lovely borough in southwest London known for its historic pubs, boutique shops, and lavish houses.

Speaking on the Table Manners with Jessie Ware podcast, Elizabeth said she and Robbie have fallen in love with Richmond and might just make their stay permanent. “I’m having the greatest time. I’m with my man partner and we’re in Richmond," she said. "We’re living this British dream, in this house, in Richmond right by the water. We want to figure out how to stay here so now we want to write a rom-com… because we don’t wanna leave."

Referring to her husband, the actress said, "He started just writing, like normal writing, not music. And so, he can do that here, so we're living this British dream in this house in Richmond right by the water."

3 When Robbie Arnett And Elizabeth Olsen Got Engaged

After three years of dating, Robbie decided to take his relationship with Elizabeth up a notch by reportedly asking her hand for marriage in mid-2019. Though their reps refused to comment on the news, Elizabeth was later photographed grocery shopping with Robbie in Los Angeles, wearing what appears to be an engagement ring.

The sparkler "featured an emerald stone surrounded by tiny diamonds", according to Us Weekly. Notably, her alleged engagement came just after rumors surfaced that her sister Ashley was engaged to her boyfriend Louis Eisner. Meanwhile, Elizabeth's other sister, Mary-Kate, was previously married to Olivier Sarkozy. She married Olivier in 2015 but filed for an emergency divorce in May 2020, amid the COVID-19 pandemic.

Related: The Real Reason Mary-Kate and Ashley Olsen Constantly Turn Down Interviews

2 When Did Robbie Arnett And Elizabeth Olsen Get Married?

Months after she referred to Robbie Arnett as her now "husband" in an interview, Elizabeth Olsen spilled the tea on their secret wedding on The Jess Cagle Show in June 2022. "Well, we never really talked much about our marriage," noted the Wind River actress. She then revealed that they eloped before the COVID pandemic and later on celebrated with a proper wedding. "I just never talked about it."

"Luckily it was [before COVID] because I had to work in England and there are visa issues with that. So that was... we luckily timed things out accidentally really well," she said, adding: "He wouldn't have been able to come at all actually. And also everything was so backed up. You couldn't even like try to get married then. But it ended up working out."

1 Robbie Arnett And Elizabeth Olsen Co-wrote A Book

Robbie Arnett and Elizabeth Olsen are not only husband and wife — they are also writing partners. In June 2022, the pair published a children's picture book Hattie Harmony: Worry Detective that aims to teach kids how to deal with anxiety. The book was illustrated by Marissa Valdez and published by Viking Children's Books. According to the Wanda actress, Hattie Harmony was inspired by the picture books she and her husband read and adored as kids.

"When we sat down to write Hattie Harmony, our goal was to create a relatable character who made talking about complicated feelings fun and engaging for kids," the pair said in a joint statement to PEOPLE. "We hope Hattie Harmony will become a welcomed reminder that it's okay to speak up when we need help... and to always treat ourselves and others with kindness."