Sienna Miller says she feels like a 'lactating heifer' and is struggling to dress her 'massive boobs' after being 'pregnant or breastfeeding for nearly four years'

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By AMELIA WYNNE, SHOWBUSINESS REPORTER

Published: 12:57 BST, 14 September 2026 | Updated: 13:04 BST, 14 September 2026

Sleep-deprived Sienna Miller has said that she feels like a 'lactating heifer' and is struggling to dress her 'massive boobs' after being 'pregnant or breastfeeding for nearly four years'.

The actress, 44, welcomed her third child in April with fiancé Oli Green, 29. The couple got engaged two months later, and also welcomed a child in January 2024.

Sienna also shares a 14-year-old daughter, Marlowe, with actor Tom Sturridge, who she dated for four years until July 2015.

In a candid new interview, the mother-of-three joked that she was so tired that she 'doesn't know who she is' any more as she juggles work and raising her brood.

She said: 'I have completely lost my fashion sense. I've been pregnant or breastfeeding for nearly four years, and I think something happens to the brain – or you're so f***ing tired – that you sacrifice your identity. 

'You're just 'mother'... and not in the Gen-Z way, as much as I would like to be.' 

Sleep-deprived Sienna Miller has said that she feels like a 'lactating heifer' and is struggling to dress her 'massive boobs' after being 'pregnant or breastfeeding for nearly four years'

The actress, 44, welcomed her third child in April with fiancé Oli Green, 29. The couple got engaged two months later, and also welcomed a child in January 2024

'I'm just really questioning all this, because I'm just so underslept and I kind of don't know who I am. I also have massive boobs, which I don't know how to dress. Anyway, this is far too much information…'. 

She also told Vogue that on the day of her interview with them she had been 'up breastfeeding since the crack of dawn', before adding: 'I just feel like a kind of lactating heifer.' 

Sienna also revealed that she often turns to model Alexa Chung - who is her ex Tom's partner - for fashion advice, including what to wear for the recent Oasis: Don't Look Back In Anger premiere.

In May, Sienna appeared on the Jimmy Fallon show in New York just three weeks after giving birth.

During her sit-down interview with the TV host she confessed that motherhood was exhausting at times.

Sienna said: 'It feels like stringing sentences together is a bit challenging. 

'I'm on very little sleep but I'm madly in love with my baby.

'It's crazy to be talking words and wearing a dress. What has happened from pajama gate.'

She said in a new interview: 'I have completely lost my fashion sense'. Sienna said she asked Alexa Chung for fashion advice for what to wear to the recent Oasis: Don't Look Back In Anger premiere (seen)

In a candid chat with Vogue this week the mother-of-three joked that she was so tired that she 'doesn't know who she is' anymore as she juggles work and raising her brood

Asked by the host which of her children are tougher to look after, she said: 'I would have said the teenage girl would be harder to juggle until the transatlantic flight I took yesterday with the toddler and the newborn.

'The toddler now wins hands down. It was an absolute disaster. 

'There's no negotiating. I got to the immigration line and just broke down.'

Sienna also spoke about motherhood in a different interview with Vogue recently. 

She said: 'I'd wanted another baby for so long that my postpartum was just bliss. I had thought, by the time I was 40, that it wouldn't happen. 

'That I'd have my one baby and I kind of made peace with it. It was such a surprise, and it was such a bonus that I was just euphoric. I felt existentially relieved.'

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