MILA Kunis has shared how she hooked-up with former co-star and now-husband Ashton Kutcher, saying she’s not sure if she’s “supposed to tell this story”.

The pair worked together for eight years on That ‘70s Show. Kunis was 14 when she got the gig while Kutcher was 19, and in an interview with Howard Stern, the actress said there was absolutely no romance between them.

“Here’s the crazy part, and I say this and nobody believes me. I never looked at him as somebody that was good looking,” she said. “I never looked at him as somebody that wasn’t. I just was like, here’s a guy that I’m working with for eight years and he’s really smart. And I had to do chemistry and he was better at chemistry than I was so he’d help me with my chemistry homework and when I was grounded he would drive me home.”

It wasn’t until a few years after the show wrapped the former co-stars crossed paths again.

Kutcher had just divorced from Demi Moore and Kunis had ended a long relationship.

Asked how their romance began, Kunis said it was supposed to be a casual, friends-with-benefits arrangement before pointing out: “I don’t even know If I’m supposed to tell this story — I might get in trouble for this, well, whatever.”

“We ran into each other out and about at an awards show,” she recalled. “So I see this guy and I see his back. And he’s really tall and I’m like, who’s that tall guy? And I’m wearing this big poofy dress and I look ridiculous and then he just turns around and it’s literally like if we were in a movie the music would start playing and the violins would go. I think he, for the first time, ever took my breath away. I was like, f*ck he’s good looking.”

Kutcher then invited her to his house-warming party — and she found out later he initially wanted to set her up with a friend of his. But that quickly changed.

“Long story short, I didn’t leave until the next morning,” she continued. “Then we ended up having a lot of talks about how this is a huge mistake and how he needs to go and be single and how I need to go and be single. It was super private for a very long time.”

She added it was the “first time ever” she’d stayed over a guy’s house after a hook-up.

“When I was single I was so adamant about, as stupid as it sounds, never staying over at a guy’s house,” she said. “I was like, peace I’m out, and he was like, you’re not leaving.”

Mila said they both didn’t want it to be anything more than casual fun, saying they’d tell each other about the other people they were seeing, but added: “Three months later I was like, this isn’t fun anymore.”