'It's nearly time!' Sienna Miller's sister Savannah reveals she's going 'full on' for her 'Christmas-themed' December wedding as she prepares to tie the knot with fiancé Jim Whewell

By Niomi Harris For Mailonline and Richard Eden for the Daily Mail

Published: | Updated:

Sienna Miller's fashion designer sister Savannah has revealed she's going 'full on' in planning her  'Christmas-themed' December wedding to fiancé Jim Whelwell.

The fashion designer, 43, took to Instagram on Wednesday to share a throwback snap of herself picking out a Christmas tree as she excitedly remarked 'It’s nearly time' for her big day.

Savannah announced her engagement to wealthy aristocrat Jim, 41, on Boxing Day last year, sharing a snap of her glittering diamond ring. 

Siblings: Sienna Miller's fashion designer sister Savannah has revealed she's going 'full on' in planning her 'Christmas-themed' December wedding to fiancé Jim Whelwell (pictured in 2018)

Siblings: Sienna Miller's fashion designer sister Savannah has revealed she's going 'full on' in planning her 'Christmas-themed' December wedding to fiancé Jim Whelwell (pictured in 2018)

The blonde beauty gave a hint of what's to come for her big day before revealing that she recently had a dress fitting. 

Captioning her post Savannah penned: 'It’s nearly time!!! I LOVE Christmas so much that we’ve decided to go full on Christmas themed with our December wedding and I can’t wait.

'Yesterday I had my dress fitting and had to really refrain from adorning myself to Christmas fairy levels of twinkle… exciting times and I’m loving every minute ❤️.'

Plans: The fashion designer, 43, took to Instagram on Wednesday to share a throwback snap of herself picking out a Christmas tree as she excitedly remarked 'It’s nearly time' for her big day

Plans: The fashion designer, 43, took to Instagram on Wednesday to share a throwback snap of herself picking out a Christmas tree as she excitedly remarked 'It’s nearly time' for her big day

But while she teased the theme of her big day, Savannah declined to reveal whether the nuptials will be held at Jim's 1,000-acre family estate, Wyresdale Park in Lancashire, or at her place in the Cotswolds, reports Daily Mail's Richard Eden.

The couple no doubt won't struggle to find bridesmaid and page boys for the wedding, with Savannah having three children - Moses, Lyra and Bali - with her ex-husband Nick Skinner.

While she also has niece Marlowe - Sienna's daughter from her relationship with Tom Strurridge. 

Her love: Savannah announced her engagement to wealthy aristocrat Jim, 41, on Boxing Day last year, sharing a snap of her glittering diamond ring (pictured together in February)

Her love: Savannah announced her engagement to wealthy aristocrat Jim, 41, on Boxing Day last year, sharing a snap of her glittering diamond ring (pictured together in February)

Savannah's upcoming wedding comes almost a year since the couple got engaged over Christmas last year. 

Sharing a sweet photo with her fiancé on Instagram, Savannah wrote: ''I didn’t think this Christmas could get any more special. Yet, in classic magic Jim fashion, I received the best gift I could ever have wished for. 

'The promise of a life filled with love and joy and this man,' she wrote next to snaps showing a dazzling diamond ring. 

Thrilled: The blonde beauty gave a hint of what's to come for her big day before revealing that she recently had a dress fitting

Thrilled: The blonde beauty gave a hint of what's to come for her big day before revealing that she recently had a dress fitting

Wedding joy: Savannah will not only have her three children to choose from as bridesmaid's and page boys, but she also has niece Marlowe - Sienna's daughter from her relationship with Tom Strurridge (pictured in 2021)

Wedding joy: Savannah will not only have her three children to choose from as bridesmaid's and page boys, but she also has niece Marlowe - Sienna's daughter from her relationship with Tom Strurridge (pictured in 2021)

Savannah was previously married Bushcraft teacher Nick Skinner, they separated in 2018. 

In 2020, Mail on Sunday revealed Nick's aristocratic best friend Ruth Guise is dating Savannah's ex Nick. To make things even more complicated, Ruth is the sister-in-law of Jim. 

Savannah explained: 'We [Nick and I] separated in February 2018 - neither of them needed to ask my permission to get together. As always, the wellbeing of the children is all of our priority.' 

Romantic: Savannah's upcoming wedding comes almost a year since the couple got engaged over Christmas last year

Romantic: Savannah's upcoming wedding comes almost a year since the couple got engaged over Christmas last year 

Former spouse: Savannah was previously married Bushcraft teacher Nick Skinner, they separated in 2018.

Former spouse: Savannah was previously married Bushcraft teacher Nick Skinner, they separated in 2018.

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