Sienna Miller: Front Row at Matthew Williamson Show

Sienna Miller sits front row at the Matthew Williamson presentation during London Fashion Week on Sunday (September 18) in London, England.

The 29-year-old actress checked out the latest from the line at the Tate Modern, where she was joined by fellow Brit Poppy Delevigne.

PHOTOS: Check out the latest pics of Sienna Miller

Sienna recently made a trip to Ethiopia with the International Medical Corps, where she helped raise awareness about the famine in East Africa.

Sienna and her older sis, Savannah, also recently released their Twenty8Twelve look book – check it out if you haven’t seen it yet!