Sienna Miller kept people guessing this Halloween with possibly the strangest costume in London.

The Layer Cake star looked bizarre in what appeared to be a poor attempt at a wizard's outfit.

It seems like the actress didn't put much thought into her costume, wearing a purple cape and strange top hat to complete her look.

The star was partying hard at the weekend and left Amika nightclub in Kensington at 5am.

Take a peek at Sienna's look below