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Caption Sienna Miller's Granny Nightgown

Calling all couture cops--it's YOU Write 'Em Up time!
/ Source: E!online

Calling all couture cops--it's YOU Write 'Em Up time!

The Perp: Sienna Miller in Ralph Lauren, at a Wimbledon party in London

First of all, the British babe looks like she's getting ready for bed, not a bash, in this prim little white lace dress. Add the frizzy ponytail, bright red lips and black boots and it's just a mishmash of bad. Sweetie, you're in danger of having your fashionista status revoked!

What do you think of Sienna's getup? Write a clever caption below and we'll our favorite blurb here and on our Facebook page.

PHOTOS: Fashion Police