Sienna Miller's sister Savannah, 42, announces engagement to wealthy aristocrat Jim Whewell

The fashion designer, 42, shared sweet photo to Instagram with her fiancé - who is heir to the 800-acre Wyresdale Park Estate in Lancaster.

Sienna Miller - Latest News and Updates on the British-American

Sienna Miller Wore A Baby-Blue Velvet Dress To Be Her Sister 's Maid Of Honour

Sienna Miller's sister Savannah, 42, announces engagement to

Sienna Miller Wore A Baby-Blue Velvet Dress To Be Her Sister 's Maid Of Honour

Sienna Miller's fashion designer sister Savannah marries wealthy

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Sienna Miller's sister Savannah, 42, announces engagement to

Sienna Miller - Latest News and Updates on the British-American

Amanda Holden flashes her bra in racy sheer dress as she counts

Sienna Miller's sister Savannah reveals she's going 'full on' for

Sienna Miller - Latest News and Updates on the British-American actress and American Sniper star - Page 4

Princess Maria Laura of Belgium, 33, announces engagement to

Sienna Miller's sister Savannah surprises in sheer corset wedding dress and sparkly tiara

Pictured: Sienna and Savannah Miller, Go Glam or Go Home: Over 100 of the Best Pictures From Last Year's Met Gala

A Simple & Elegant Savannah Miller Wedding Dress for a Modern Glasgow City Centre Wedding

Fashion Designer Savannah Miller Talks Bagsy, Boho Chick and Brexit – Grazia

Savannah Miller Launches Partnership With Justin Alexander Luxury Group — The Bridal Council