Sienna Miller attended Matthew Williamson’s book launch party last night held at the Somerset house in London.
And the actress, pictured above with Williamson, opted to wear that blue creation of his.
While the top of the dress doesn’t look like it's fitted properly, the gown itself is gorgeous.
The color and fabric make it an eye catcher.
As for her hair and makeup, Miller kept it simple to not take away from the gown.
What do U think of her overall look?
[Image via XposurePhotos.com.]