Mila Kunis was convinced she would never marry Ashton Kutcher because their relationship began as a casual fling.
The 32-year-old actress first met Ashton in the late 1990s when they starred together in hit TV series That '70s Show, in which they played lovers.
They reunited after Ashton split from his ex-wife Demi Moore in late 2011, and their friendship turned romantic in 2012. They became engaged in 2014 and wed in July, 2015, nine months after Mila gave birth to the couple's first child, daughter Wyatt.
However, in a candid chat with U.S. shock jock Howard Stern, Mila confesses she never thought the former Two and a Half Men star would become her husband, because they initially agreed they were just going to "have fun."
"We started dating with the idea we both were never going to get married," she said.
The actress reveals she stayed the night the first time they reconnected at Ashton's housewarming party, and they embarked on a casual relationship.
"Long story short, I didn't leave until the next morning," she candidly admitted. "(It was) the first time I ever slept over while I was single."
But Mila had a hard time fighting her feelings for her now-husband—just like her character in romantic comedy Friends with Benefits, and his in No Strings Attached, which featured a similar plotline.
"If we just paid attention to these movies, we should know that s**t like this does not work out in real life," Kunis laughed. "We clearly didn't pay attention and we shook hands and said, 'Let's just have fun.' Literally, we lived out our movies."
"So then we ended up having a lot of talks about how this is a huge mistake... We both were in agreement, 'This is just fun,'" Mila recalled. "Three months later, I was like, 'This isn't fun anymore!'"
Despite their unconventional road to marriage, Mila, who is expecting the couple's second child, knows it was best to start the romance as good friends.
"We can't bulls**t each other," she told Glamour magazine earlier this month. "I literally can't lie to him. He can call me out on everything, and I can do the same, because there's nothing about the other person's face that we don't know. We know when they're acting, thus we know when they're lying.
"There's nothing we don't know about each other because we've known each other for so long: the ugly, the bad, the good. We went through a period where I thought he was crazy. At the height of his career, I was like, 'Ugh, I don't like you. I don't even know you anymore,'... then we'd get back together and be like, 'Oh, sorry. I didn't mean to overreact.'"
And Mila wouldn't change it for the world: "It truly is being married to your best friend," she concluded. "That's a cliche; it's cheesy. But it's true."