An unexpected romance! Amanda Seyfried and Thomas Sadoski started off their relationship as costars but later found themselves falling head over heels.

The pair met in May 2015 while working together on the Off-Broadway play The Way We Get By. At the time, Seyfried was in a relationship with Justin Long. Sadoski, for his part, was married to Kimberly Hope.

The Mean Girls star told PorterEdit in July 2018 that her bond with Sadoski was strictly platonic while they were in their respective relationships.

“[He] never flirted, never disrespected his wife,” Seyfried said at the time. “That was another reason why I thought, later on, that I could marry him.”

However, Sadoski was impressed with Seyfried on a professional level. In October 2015, the actor praised his costar during an interview with New York’s Pix 11.

“I feel like the luckiest guy in New York right now,” he said at the time. “One of the great American playwrights, one of the great American directors and a perfect scene partner. I’m a pretty happy guy.”

Later that month, Sadoski split from Hope after eight years of marriage. Seyfried also ended her two-year relationship with Long in September 2015.

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The Mamma Mia! star and Sadoski reunited for the film The Last Word in early 2016. Us Weekly confirmed that the pair were an item in March 2016 after the duo were spotted arriving together on set. Six months later, Us broke the news that the twosome had gotten engaged after a whirlwind romance.

Seyfried and the Newsroom alum secretly tied the knot in March 2017 while the actress was nine months pregnant with their daughter, Nina, who arrived less than two weeks later. The Pennsylvania native told PorterEdit in July 2018 that she wanted to make sure she was married before giving birth.

“I really wanted to have rings on in the hospital, you know?” she said at the time. “And what if something goes wrong, and he’s not legally my husband?”

Seyfried added that the ceremony was a low-key affair followed by brunch at Cheebo in Los Angeles. “We got married in Topanga, March last year,” she said at the time. “Just the two of us. And afterwards, I was like, ‘Can we just go to Cheebo?’ It was awesome.”

The pair announced the birth of their second child in September 2020 in a statement via the organizations INARA and War Child.

“Since the birth of our daughter three years ago our commitment to the innocent children that are so brutally affected by conflict and war has been a driving force in our lives,” the couple wrote. “With the birth of our son the work of INARA and War Child has become our North Star.”

Scroll down to see Seyfried and Sadoski’s relationship through the years.

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Seyfried and Sadoski met while costarring in the Off-Broadway play The Way We Get By.

Us confirmed that the couple were dating after Seyfried reunited with Sadoski on the film The Last Word.

The duo packed on the PDA while attending Paris Fashion Week together.

Us broke the news that Seyfried and Sadoski were engaged after six months of dating. 

The Les Misérables actress debuted her baby bump on the red carpet to promote her and Sadoski’s film, The Last Word.

The pair secretly got married in Topanga, California, while Seyfried was nine months pregnant with their first child. The couple welcomed their daughter, Nina, less than two weeks later.

Seyfried celebrated her three-year wedding anniversary with Sadoski in a sweet Instagram tribute. “Happy 3, Tommy,” she captioned a photo with the Wild star. “Goat wrangling is far easier and way more fun when we do it together. 💞”

Seyfried opened up about quarantining with her family in upstate New York amid the coronavirus pandemic during an episode of the video series Molner’s Table. “Our family is still together,” she said at the time. “I definitely think my marriage is, like, even stronger.”

The couple announced the birth of baby No. 2 with the help of the nonprofit organizations INARA and War Child.

“Since the birth of our daughter three years ago our commitment to the innocent children that are so brutally affected by conflict and war has been a driving force in our lives,” Seyfried and Sadoski wrote in a statement. “With the birth of our son, the work of INARA and War Child has become our North Star.”

“HAPPY ANNIVERSARY @thomas_sadoski 🩹🎈4️⃣,” the Mank star captioned a tribute post to her love via Instagram.

Amid the coronavirus pandemic, the couple encouraged their Instagram followers to get vaccinated. They posted a selfie wearing matching black shirts and masks along with red Band-Aids on their arms.

“Happy Mother’s Day to my favorite Yarnabomber and all the other creative anarchist badass mama’s out there,” Sadoski captioned a Mother’s Day tribute to his partner.

The Oscar nominee gushed about Sadoski as the “father of my dreams” via Instagram for Father’s Day.

“The vibe [in Hudson County] just suits them all as a family, they love being around nature and away from the hustle of city life,” a source exclusively told Us of the private pair. “Amanda loves to hike. She and Thomas [are] huge fans of the outdoors and they’ve been taking the kids out locally, plus exploring more of the East Coast.”

While the Mank actress “commutes back and forth” to Los Angeles for work, Sadoski is “equally adept” at “being a hands-on dad and taking care of business at home when she’s busy,” the insider explained.

 The source added: “They try to time their schedules that way, as well as making plenty of time for date nights and trips away by themselves.”

Sadoski supported his wife at the 74th Primetime Emmy Awards, where she won the Outstanding Lead Actress in a Limited or Anthology Series or Movie trophy for her role in The Dropout.

“Thank you, my family. [Thank you to] my mom, my husband, my dad and my kids — and my dog Finn! Thank you so much,” Seyfried gushed in her acceptance speech at the time.

The twosome dressed up for a Halloween celebration on October 29.