Sienna Miller forVogue’s Winter 2024 issue; Oli Green.Photo:Annie Leibovitz/Vogue;Getty

Sienna Miller Vogue and oli green

Annie Leibovitz/Vogue;Getty

Love is love forSienna Miller.

The actress, who turns 42 this month, opened up toVoguein a cover interview for the magazine’s Winter 2024 issue about expecting her and boyfriendOli Green’s first child together, and their 14-year age gap.

“I would imagine it would be complicated for anyone to get their head around, but there’s been nothing but love and joy,” Miller said of her relationship with Green, 27.

But for her beau, “It is real that I might want to be with someone older,” said theAmerican Womanstar.

At the end of the day, though, “I don’t think you can legislate on matters of the heart," Miller said. “I certainly have never been able to.”

Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from celebrity news to compelling human-interest stories.

Sienna Miller and Oli Green forVogue’s Winter 2024 issue.Annie Leibovitz/Vogue

VOGUE’S WINTER 2024 COVER STAR IS SIENNA MILLER

Annie Leibovitz/Vogue

Miller toldVoguethat when she’s with Green’s friends, “There’s awareness of the dynamics that enter relationships between men and women now that we just didn’t have 20 or 25 years ago.”

“I feel like my whole adolescence was dodging bullets and advances in a really delicate way, to not offend somebody,” she continued. “Whereas the girls that he grew up with, they’re probably like,No — no, thank you. Moving on.”

Elsewhere in the interview, Miller recalled the beginning of their romance, when they kissed early on after meeting. But then she pulled back.

Sienna Miller on the cover ofVogue’s Winter 2024 issue.Annie Leibovitz/Vogue

VOGUE’S WINTER 2024 COVER STAR IS SIENNA MILLER

“I see so much of her in [Oli],” added Blunt, 40, “in that free-spirited, curious, guileless thing that he has. He’s the kind of guy you could just bring anywhere, and everyone would love him.”

She also shared a story about one of Miller and Green’sfirst datesin New York City, when Blunt came along for support — the kind that didn’t end up being needed.

“When I got there, it was so beautiful between them. I just gave her a hug and went, ‘I’m going to slip away,' " Blunt said.

source: people.com