Sienna Miller supported her designer pal Matthew Williamson at his book launch party which was held at Somerset House in London yesterday.

The Brit actress hosted the event and wrote the forward for the book.

She of course wore a Matthew Williamson dress fresh from the Spring 2011 runway.

I love the electric blue dress on the runway, but I feel the dress slightly overwhelms Sienna tiny frame.

As the host I get she wanted something more dramatic and different from her usual look, but it’s not really working for me.

Does it work for you?

Credit: Style.it & Newscom