Sienna Miller opened up about her dizzying romance with boyfriend Oli Greene.

"I wasn't expecting a serious relationship, but we fell in love so fast," Miller explained in a new Harper's Bazaar U.K. cover story. More importantly, "Fuck! I was like, 'Why are you so young, you're annoying'"

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Miller is 42 years old to Green's 27, and according to Us Weekly, the two have been dating since around 2021 through a mutual friend.

Miller explained to Harper's that she never intended to date someone younger, but that there are distinct advantages to dating someone with the kind of mindset that younger millennials/older Gen-Zers have.

"There is a difference in the way men of that generation respect women. 'He's very wise and well-adjusted. They have grown up on a more level playing field.

In January 2024, a baby girl was born to Miller and Green. The child is the "Anatomy of a Scandal" actress' second child, following daughter Marlowe (11), whom she had with ex-boyfriend Tom Sturridge. She was in a relationship with Sturridge from 2011 to 2015. Prior to that, she was famously in a relationship with actor Jude Law in the 2000s.

Miller opened up about her relationship with Green in a December 2023 interview with Vogue magazine, explaining that they kissed when they first met. She said, "This is ridiculous. This isn't going anywhere."

"And he tried so hard to convince me to go out for a drink with him."

Miller eventually agreed, but asked his friend Emily Blunt to go along on one of the dates. 'When I got there, it was so beautiful between the two of us,' Blunt told Vogue. I just hugged her and thought, "Let's get out of here," Brandt told Vogue."

Talk about true love.