She’s had a difficult couple of weeks.

But Sienna Miller put on a brave face, stepping out in style last night at Number 10 Downing Street for an official London Fashion Week reception.

Accompanied by sister and business partner Savannah, it was her first public appearance since her second break-up with Jude Law.

The actress and designer was, perhaps, not looking her usual effervescent self, but sparkled nonetheless in a black minidress, presumably her own label, Twenty8 Twelve.

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