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's sister Savannah, 42, announces engagement to

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 Wore a Baby-Blue Velvet Minidress to Be Her Sister's

Sienna Miller's fashion designer sister Savannah weds in dress of her own design - OK! Magazine

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

Incredible moment family separated at Auschwitz reunite after 70

Princess Maria Laura of Belgium, 33, announces engagement to

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

Sienna Miller's fashion designer sister Savannah, 43, marries

Sienna Miller's fashion designer sister Savannah marries wealthy

Princess Maria Laura of Belgium, 33, announces engagement to