Sienna Miller showed off her latest post-show ensemble last night following a performance of Flare Path in London. She was still rocking her acid washed jeans from earlier in the week, which she paired with the bright yellow oxfords she's had since 2009. Sienna had a special guest for yesterday's event, as her mom Jo was on hand to see the play. Sienna joined another of the Miller girls, Savannah, earlier in the day for a Spring/Summer 2012 design review for their Twenty8Twelve collection. The sisters have been busy promoting the line lately, but Sienna still has free time to focus on her Spring romance with her coffee date buddy Tom Sturridge.