Sienna Miller’s sister Savannah, 47, reveals she is expecting her first child with new husband James Whewell as she shares joy at being pregnant at the same time as her sibling

Sienna Miller’s sister Savannah has revealed she is pregnant with her first child with her new husband James Whewell.

The fashion designer, 47, tied the knot with James in 2024 after splitting from her ex-husband Nick Skinner, who she shares three children with, in 2018. 

Taking to Instagram on Saturday, Savannah shared the happy news that she is getting to ‘relive pregnancy’ with James as they are expecting their first child together.

In her sweet post, Savannah shared her joy at being pregnant at the same time as her actor Sienna, 44 – who is set to welcome her second child with her boyrfiend Oli Green, 29.

Sharing photos of her baby bump, Savannah said: ‘Our longed for miracle baby is joining gang in August! 

‘To be able to relive the magic of pregnancy, with Jim, who is the most deserving and dedicated dad already to my three, is a profound and phenomenal gift. 

‘Now I know how brief it all is, on the cusp of my firstborn’s 21st birthday, I hope to be able to slowly savour the innocence and wonder in every minute. 

‘To be doing it all over again at the same time as my sister is the most delicious cherry on the icing on the cake.’

It comes after Savannah’s sister, actress Sienna, made a return to Instagram after eight years with a snap of her blossoming bump on Friday ahead of welcoming her and Oli’s second child. 

The actress, 44, already shares a daughter with the model, 29, who they welcomed in January 2024, as well as 13-year-old Marlowe with ex-boyfriend Tom Sturridge.

In the beaming snap she held up her chunky knitted sweater to show off her bump which was shielded slightly beneath a T-shirt. 

Sienna also donned a fluffy winter hat as she pulled a fun face for the camera alongside memes poking fun at her return to social media, following her last post in May 2017.

Alongside a snap of Michael Jordan’s iconic 1995 two words fax as he came out of retirement was a meme of the late film director David Lynch refusing to any further on a previous statement.

Pals were delighted to see her back on the platform with Jennifer Aniston’s ex, actor Justin Theroux, writing: ‘omg the non-stop posting w you! It’s relentless’. 

While Poppy Delevingne added: ‘Boooooooooooooodles about’: and pregnant Laura Whitmore wrote: ‘Relatable’.

It comes after Sienna said an older woman being in a relationship with a younger man is ‘still fetishised’ amid her romance with Oli. 

Speaking to Grazia, she recalled the early days of her acting career and how she once auditioned to play the love interest of a 45-year-old actor when she was 21.     

Sienna said: ‘Things have moved on since then, but the idea of an older woman with a younger man, for example, is still fetishised rather than normalised – there’s a disparity there that I would love to see disappear.’

Sienna and Oli first began dating in 2021. He is also an actor and has starred alongside Florence Pugh and Morgan Freeman in 2023’s A Good Person, and Imelda Staunton and Dominic West, in an episode of The Crown the same year.

The actress, who announced her current pregnancy when she debuted her baby bump at The Fashion Awards in December, also discussed her cravings. 

‘I’m hooked on vinegary things at the moment,’ she said, adding that she has also been indulging in a lot of peanut butter and jam on toast. 

Sienna lamented having to go through another round of postpartum hair loss.  

‘It’s these bits,’ she said, twirling a few hairs around her fingers. ‘They’re just starting to grow back properly and now it’s all going to go again.’