Sienna Miller is finding being pregnant in her 40s "so much easier" than her 20s.

The 44-year-old actress is expecting her third child, and she says being pregnant in her 40s is "the best" because her life is in a "more grounded space" now.

Sienna - who has a two-year-old daughter with actor Oli Green, and 13-year-old daughter Marlowe with her ex-boyfriend Tom Sturridge - told Glamour magazine: "Having had a baby at 29, and then having a baby at 42, and now 44, it's so much easier when you don't have the conflict of feeling scattered and like you want to be doing X, Y, Z.

"If I'm in bed at 9 p.m. with a book, I'm so happy now.

"And now I've got the excuse to do it.

"Life is in a more grounded space. I think the 30s are chaos.

"You're like, 'I want to settle down. I want kids.' "

Sienna has also found being pregnant in her 40s easier because she doesn't care "what anyone else thinks".

She added: "But by the time you hit 40, you're like, 'I kind of know who I am. I don't really give a s**t about what anyone else thinks.'

"I'm a much more grounded human.

"We don't judge men who are having kids in their 80s. Why on earth is there any sort of narrative?"

The Layer Cake star previously froze some eggs, but she "didn't use them", and she counts herself as "really fortunate" to be pregnant again naturally.

She added: "And I froze eggs. That was really revealing. I didn't use them.

"I was really fortunately able just to get pregnant, but it was an existential relief having done that in my late 30s."

Earlier this month, Sienna admitted she was "looking forward to taking some time off" as she prepared for the birth of her third child.

She told Grazia magazine: "I'm looking forward to taking some time off, being with my kids more consistently and surrendering to how random life is.

"That's something that I'm much more curious about as I get older - I have a much clearer understanding of how quickly life goes.

"I've always tried to fill my life with as much diversity as possible, and it's never been boring, so I'm excited to buckle up and continue whatever journey comes my way - the highs, the lows and everything in-between."